diff --git a/app/build.gradle b/app/build.gradle
index 29a8030..bb0ba6c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,7 +1,5 @@
 apply plugin: 'com.android.application'
-
 apply plugin: 'kotlin-android'
-
 apply plugin: 'kotlin-android-extensions'
 
 android {
@@ -32,4 +30,4 @@ dependencies {
     androidTestImplementation 'androidx.test:runner:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
     implementation project(':cravecalculator')
-}
+}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index f30236b..e54706f 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -5,7 +5,7 @@
     <application
             android:allowBackup="true"
             android:icon="@mipmap/ic_launcher"
-            android:label="@string/app_name"
+            android:label="@string/c_calc_app_name"
             android:roundIcon="@mipmap/ic_launcher_round"
             android:supportsRtl="true"
             android:theme="@style/AppTheme">
diff --git a/build.gradle b/build.gradle
index 61dfae1..2f12d88 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,3 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
 buildscript {
     ext.kotlin_version = '1.3.21'
     repositories {
@@ -8,10 +6,8 @@ buildscript {
 
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.1'
+        classpath 'com.android.tools.build:gradle:3.3.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
     }
 }
 
@@ -25,4 +21,4 @@ allprojects {
 
 task clean(type: Delete) {
     delete rootProject.buildDir
-}
+}
\ No newline at end of file
diff --git a/cravecalculator/build.gradle b/cravecalculator/build.gradle
index 17bc3d1..daed752 100644
--- a/cravecalculator/build.gradle
+++ b/cravecalculator/build.gradle
@@ -4,31 +4,23 @@ apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion 28
-
-
-
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
-
     }
-
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
-
 }
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-
     implementation 'com.android.support:appcompat-v7:28.0.0'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
diff --git a/cravecalculator/src/main/java/com/cravefood/cravecalculator/CalculatorFragment.kt b/cravecalculator/src/main/java/com/cravefood/cravecalculator/CalculatorFragment.kt
index 72c5551..5f5b9fa 100644
--- a/cravecalculator/src/main/java/com/cravefood/cravecalculator/CalculatorFragment.kt
+++ b/cravecalculator/src/main/java/com/cravefood/cravecalculator/CalculatorFragment.kt
@@ -9,7 +9,7 @@ import android.widget.Toast
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProviders
-import kotlinx.android.synthetic.main.calculator_fragment.*
+import kotlinx.android.synthetic.main.c_calc_fragment.*
 
 
 class CalculatorFragment : Fragment() {
@@ -19,7 +19,7 @@ class CalculatorFragment : Fragment() {
     private var onConfirmListener: ((Double) -> Unit)? = null
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
-        return inflater.inflate(R.layout.calculator_fragment, container, false)
+        return inflater.inflate(R.layout.c_calc_fragment, container, false)
     }
 
     override fun onActivityCreated(savedInstanceState: Bundle?) {
diff --git a/cravecalculator/src/main/res/drawable/ic_divide.xml b/cravecalculator/src/main/res/drawable/c_calc_ic_divide.xml
similarity index 100%
rename from cravecalculator/src/main/res/drawable/ic_divide.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ic_divide.xml
diff --git a/cravecalculator/src/main/res/drawable/ic_equal.xml b/cravecalculator/src/main/res/drawable/c_calc_ic_equal.xml
similarity index 100%
rename from cravecalculator/src/main/res/drawable/ic_equal.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ic_equal.xml
diff --git a/cravecalculator/src/main/res/drawable/ic_minus.xml b/cravecalculator/src/main/res/drawable/c_calc_ic_minus.xml
similarity index 100%
rename from cravecalculator/src/main/res/drawable/ic_minus.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ic_minus.xml
diff --git a/cravecalculator/src/main/res/drawable/ic_plus.xml b/cravecalculator/src/main/res/drawable/c_calc_ic_plus.xml
similarity index 100%
rename from cravecalculator/src/main/res/drawable/ic_plus.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ic_plus.xml
diff --git a/cravecalculator/src/main/res/drawable/ic_times.xml b/cravecalculator/src/main/res/drawable/c_calc_ic_times.xml
similarity index 100%
rename from cravecalculator/src/main/res/drawable/ic_times.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ic_times.xml
diff --git a/cravecalculator/src/main/res/drawable/ripple_cancel_button.xml b/cravecalculator/src/main/res/drawable/c_calc_ripple_cancel_button.xml
similarity index 76%
rename from cravecalculator/src/main/res/drawable/ripple_cancel_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ripple_cancel_button.xml
index ada42fa..26848a8 100644
--- a/cravecalculator/src/main/res/drawable/ripple_cancel_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_ripple_cancel_button.xml
@@ -2,5 +2,5 @@
 <ripple xmlns:android="http://schemas.android.com/apk/res/android"
         android:color="?android:colorControlHighlight">
   <item android:id="@android:id/mask"
-        android:drawable="@drawable/shape_cancel_button"/>
+        android:drawable="@drawable/c_calc_shape_cancel_button"/>
 </ripple>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/drawable/ripple_confirm_button.xml b/cravecalculator/src/main/res/drawable/c_calc_ripple_confirm_button.xml
similarity index 71%
rename from cravecalculator/src/main/res/drawable/ripple_confirm_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ripple_confirm_button.xml
index 9fa823d..9e14ade 100644
--- a/cravecalculator/src/main/res/drawable/ripple_confirm_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_ripple_confirm_button.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ripple xmlns:android="http://schemas.android.com/apk/res/android"
         android:color="?android:colorControlHighlight">
-  <item android:drawable="@drawable/shape_confirm_button"/>
+  <item android:drawable="@drawable/c_calc_shape_confirm_button"/>
 </ripple>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/drawable/c_calc_ripple_equal_button.xml b/cravecalculator/src/main/res/drawable/c_calc_ripple_equal_button.xml
new file mode 100644
index 0000000..b1d3258
--- /dev/null
+++ b/cravecalculator/src/main/res/drawable/c_calc_ripple_equal_button.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+        android:color="@color/cCalColorRippleButton">
+  <item android:drawable="@drawable/c_calc_shape_equal_button"/>
+</ripple>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/drawable/ripple_numbers_button.xml b/cravecalculator/src/main/res/drawable/c_calc_ripple_numbers_button.xml
similarity index 75%
rename from cravecalculator/src/main/res/drawable/ripple_numbers_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_ripple_numbers_button.xml
index 9bd85d9..050a4b8 100644
--- a/cravecalculator/src/main/res/drawable/ripple_numbers_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_ripple_numbers_button.xml
@@ -2,5 +2,5 @@
 <ripple xmlns:android="http://schemas.android.com/apk/res/android"
         android:color="?android:colorControlHighlight">
   <item android:id="@android:id/mask"
-        android:drawable="@drawable/shape_numbers_button"/>
+        android:drawable="@drawable/c_calc_shape_numbers_button"/>
 </ripple>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/drawable/c_calc_ripple_operations_button.xml b/cravecalculator/src/main/res/drawable/c_calc_ripple_operations_button.xml
new file mode 100644
index 0000000..432e79d
--- /dev/null
+++ b/cravecalculator/src/main/res/drawable/c_calc_ripple_operations_button.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+        android:color="@color/cCalColorRippleButton">
+  <item android:drawable="@drawable/c_calc_shape_operations_button"/>
+</ripple>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/drawable/selector_confirm_button.xml b/cravecalculator/src/main/res/drawable/c_calc_selector_confirm_button.xml
similarity index 62%
rename from cravecalculator/src/main/res/drawable/selector_confirm_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_selector_confirm_button.xml
index 8ceab66..fbfbea2 100644
--- a/cravecalculator/src/main/res/drawable/selector_confirm_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_selector_confirm_button.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-  <item android:state_enabled="false" android:drawable="@drawable/shape_confirm_button_disabled"/>
-  <item android:drawable="@drawable/ripple_confirm_button"/>
+  <item android:state_enabled="false" android:drawable="@drawable/c_calc_shape_confirm_button_disabled"/>
+  <item android:drawable="@drawable/c_calc_ripple_confirm_button"/>
 </selector>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/drawable/shape_cancel_button.xml b/cravecalculator/src/main/res/drawable/c_calc_shape_cancel_button.xml
similarity index 82%
rename from cravecalculator/src/main/res/drawable/shape_cancel_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_shape_cancel_button.xml
index 2b4af96..9ce0c58 100644
--- a/cravecalculator/src/main/res/drawable/shape_cancel_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_shape_cancel_button.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-  <solid android:color="@color/colorCancelButtonBackground"/>
+  <solid android:color="@color/cCalColorCancelButtonBackground"/>
   <padding android:left="8dp"
            android:top="8dp"
            android:right="8dp"
diff --git a/cravecalculator/src/main/res/drawable/shape_confirm_button.xml b/cravecalculator/src/main/res/drawable/c_calc_shape_confirm_button.xml
similarity index 81%
rename from cravecalculator/src/main/res/drawable/shape_confirm_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_shape_confirm_button.xml
index 5fc2612..c39cdd5 100644
--- a/cravecalculator/src/main/res/drawable/shape_confirm_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_shape_confirm_button.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-  <solid android:color="@color/colorConfirmButtonBackground"/>
+  <solid android:color="@color/cCalColorConfirmButtonBackground"/>
   <padding android:left="8dp"
            android:top="8dp"
            android:right="8dp"
diff --git a/cravecalculator/src/main/res/drawable/shape_confirm_button_disabled.xml b/cravecalculator/src/main/res/drawable/c_calc_shape_confirm_button_disabled.xml
similarity index 85%
rename from cravecalculator/src/main/res/drawable/shape_confirm_button_disabled.xml
rename to cravecalculator/src/main/res/drawable/c_calc_shape_confirm_button_disabled.xml
index 6405a8a..c3a20f1 100644
--- a/cravecalculator/src/main/res/drawable/shape_confirm_button_disabled.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_shape_confirm_button_disabled.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-  <solid android:color="@color/colorDisabled"/>
+  <solid android:color="@color/cCalColorDisabled"/>
   <padding android:left="8dp"
            android:top="8dp"
            android:right="8dp"
diff --git a/cravecalculator/src/main/res/drawable/shape_numbers_button.xml b/cravecalculator/src/main/res/drawable/c_calc_shape_equal_button.xml
similarity index 82%
rename from cravecalculator/src/main/res/drawable/shape_numbers_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_shape_equal_button.xml
index fc8d5eb..1729dda 100644
--- a/cravecalculator/src/main/res/drawable/shape_numbers_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_shape_equal_button.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-  <solid android:color="@color/colorNumbersButtonBackground"/>
+  <solid android:color="@color/cCalColorEqualButtonBackground"/>
   <padding android:left="8dp"
            android:top="8dp"
            android:right="8dp"
diff --git a/cravecalculator/src/main/res/drawable/shape_operations_button.xml b/cravecalculator/src/main/res/drawable/c_calc_shape_numbers_button.xml
similarity index 81%
rename from cravecalculator/src/main/res/drawable/shape_operations_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_shape_numbers_button.xml
index 8c4b07f..74c69fe 100644
--- a/cravecalculator/src/main/res/drawable/shape_operations_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_shape_numbers_button.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-  <solid android:color="@color/colorOperationsButtonBackground"/>
+  <solid android:color="@color/cCalColorNumbersButtonBackground"/>
   <padding android:left="8dp"
            android:top="8dp"
            android:right="8dp"
diff --git a/cravecalculator/src/main/res/drawable/shape_equal_button.xml b/cravecalculator/src/main/res/drawable/c_calc_shape_operations_button.xml
similarity index 81%
rename from cravecalculator/src/main/res/drawable/shape_equal_button.xml
rename to cravecalculator/src/main/res/drawable/c_calc_shape_operations_button.xml
index 48205d8..766ad6e 100644
--- a/cravecalculator/src/main/res/drawable/shape_equal_button.xml
+++ b/cravecalculator/src/main/res/drawable/c_calc_shape_operations_button.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-  <solid android:color="@color/colorEqualButtonBackground"/>
+  <solid android:color="@color/cCalColorOperationsButtonBackground"/>
   <padding android:left="8dp"
            android:top="8dp"
            android:right="8dp"
diff --git a/cravecalculator/src/main/res/drawable/ripple_equal_button.xml b/cravecalculator/src/main/res/drawable/ripple_equal_button.xml
deleted file mode 100644
index 85d7d6e..0000000
--- a/cravecalculator/src/main/res/drawable/ripple_equal_button.xml
+++ /dev/null
@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<ripple xmlns:android="http://schemas.android.com/apk/res/android"
-        android:color="@color/colorRippleButton">
-  <item android:drawable="@drawable/shape_equal_button"/>
-</ripple>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/drawable/ripple_operations_button.xml b/cravecalculator/src/main/res/drawable/ripple_operations_button.xml
deleted file mode 100644
index 906756d..0000000
--- a/cravecalculator/src/main/res/drawable/ripple_operations_button.xml
+++ /dev/null
@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<ripple xmlns:android="http://schemas.android.com/apk/res/android"
-        android:color="@color/colorRippleButton">
-  <item android:drawable="@drawable/shape_operations_button"/>
-</ripple>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/font/lato_regular.ttf b/cravecalculator/src/main/res/font/c_calc_lato_regular.ttf
similarity index 100%
rename from cravecalculator/src/main/res/font/lato_regular.ttf
rename to cravecalculator/src/main/res/font/c_calc_lato_regular.ttf
diff --git a/cravecalculator/src/main/res/font/lato_semibold.ttf b/cravecalculator/src/main/res/font/c_calc_lato_semibold.ttf
similarity index 100%
rename from cravecalculator/src/main/res/font/lato_semibold.ttf
rename to cravecalculator/src/main/res/font/c_calc_lato_semibold.ttf
diff --git a/cravecalculator/src/main/res/layout/calculator_fragment.xml b/cravecalculator/src/main/res/layout/c_calc_fragment.xml
similarity index 84%
rename from cravecalculator/src/main/res/layout/calculator_fragment.xml
rename to cravecalculator/src/main/res/layout/c_calc_fragment.xml
index acbcc76..56b0a54 100644
--- a/cravecalculator/src/main/res/layout/calculator_fragment.xml
+++ b/cravecalculator/src/main/res/layout/c_calc_fragment.xml
@@ -35,7 +35,7 @@
 
       <TextView
           android:id="@+id/textViewOperation"
-          style="@style/TextViewOperation"/>
+          style="@style/CCalcTextViewOperation"/>
     </HorizontalScrollView>
 
     <TextView
@@ -43,7 +43,7 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         android:id="@+id/textViewResult"
-        style="@style/TextViewPreview"/>
+        style="@style/CCalcTextViewPreview"/>
 
     <Button
         android:id="@+id/buttonClear"
@@ -51,10 +51,10 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toEndOf="@+id/guidelineEnd"
         app:layout_constraintBottom_toTopOf="@+id/imageButtonDivide"
-        android:text="@string/clear"
+        android:text="@string/c_calc_clear"
         android:textSize="18sp"
-        android:textColor="@color/colorOperationsButtonIcon"
-        style="@style/ButtonOperations"/>
+        android:textColor="@color/cCalColorOperationsButtonIcon"
+        style="@style/CCalcButtonOperations"/>
 
     <ImageButton
         android:id="@+id/imageButtonDivide"
@@ -62,8 +62,8 @@
         app:layout_constraintBottom_toTopOf="@+id/imageButtonTimes"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/buttonClear"
-        android:src="@drawable/ic_divide"
-        style="@style/ButtonOperations"
+        android:src="@drawable/c_calc_ic_divide"
+        style="@style/CCalcButtonOperations"
         tools:ignore="ContentDescription"/>
 
     <Button
@@ -71,8 +71,8 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toStartOf="@+id/guidelineStart"
         app:layout_constraintBottom_toTopOf="@+id/button4"
-        style="@style/ButtonNumbers"
-        android:text="@string/_7"
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_7"
         android:layout_marginTop="8dp"
         app:layout_constraintTop_toTopOf="@+id/guidelineHorizontal"/>
 
@@ -81,8 +81,8 @@
         app:layout_constraintStart_toEndOf="@+id/guidelineStart"
         app:layout_constraintEnd_toStartOf="@+id/guidelineMiddle"
         app:layout_constraintBottom_toTopOf="@+id/button5"
-        style="@style/ButtonNumbers"
-        android:text="@string/_8"
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_8"
         android:layout_marginTop="8dp"
         app:layout_constraintTop_toTopOf="@+id/guidelineHorizontal"/>
 
@@ -91,8 +91,8 @@
         app:layout_constraintStart_toEndOf="@+id/guidelineMiddle"
         app:layout_constraintEnd_toStartOf="@+id/guidelineEnd"
         app:layout_constraintBottom_toTopOf="@+id/button6"
-        style="@style/ButtonNumbers"
-        android:text="@string/_9"
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_9"
         android:layout_marginTop="8dp"
         app:layout_constraintTop_toTopOf="@+id/guidelineHorizontal"/>
 
@@ -102,8 +102,8 @@
         app:layout_constraintBottom_toTopOf="@+id/imageButtonMinus"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/imageButtonDivide"
-        android:src="@drawable/ic_times"
-        style="@style/ButtonOperations"
+        android:src="@drawable/c_calc_ic_times"
+        style="@style/CCalcButtonOperations"
         tools:ignore="ContentDescription"/>
 
     <Button
@@ -112,8 +112,8 @@
         app:layout_constraintBottom_toTopOf="@+id/button1"
         app:layout_constraintEnd_toStartOf="@+id/guidelineStart"
         app:layout_constraintTop_toBottomOf="@+id/button7"
-        style="@style/ButtonNumbers"
-        android:text="@string/_4"/>
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_4"/>
 
     <Button
         android:id="@+id/button5"
@@ -121,8 +121,8 @@
         app:layout_constraintEnd_toStartOf="@+id/guidelineMiddle"
         app:layout_constraintBottom_toTopOf="@+id/button2"
         app:layout_constraintTop_toBottomOf="@+id/button8"
-        style="@style/ButtonNumbers"
-        android:text="@string/_5"/>
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_5"/>
 
     <Button
         android:id="@+id/button6"
@@ -130,8 +130,8 @@
         app:layout_constraintEnd_toStartOf="@+id/guidelineEnd"
         app:layout_constraintTop_toBottomOf="@+id/button9"
         app:layout_constraintBottom_toTopOf="@+id/button3"
-        style="@style/ButtonNumbers"
-        android:text="@string/_6"/>
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_6"/>
 
     <ImageButton
         android:id="@+id/imageButtonMinus"
@@ -139,18 +139,18 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/imageButtonTimes"
         app:layout_constraintBottom_toTopOf="@+id/imageButtonPlus"
-        style="@style/ButtonOperations"
+        style="@style/CCalcButtonOperations"
         tools:ignore="ContentDescription"
-        android:src="@drawable/ic_minus"/>
+        android:src="@drawable/c_calc_ic_minus"/>
 
     <Button
         android:id="@+id/button1"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toStartOf="@+id/guidelineStart"
         app:layout_constraintTop_toBottomOf="@+id/button4"
-        style="@style/ButtonNumbers"
+        style="@style/CCalcButtonNumbers"
         app:layout_constraintBottom_toTopOf="@+id/buttonPoint"
-        android:text="@string/_1"/>
+        android:text="@string/c_calc_1"/>
 
     <Button
         android:id="@+id/button2"
@@ -158,8 +158,8 @@
         app:layout_constraintStart_toEndOf="@+id/guidelineStart"
         app:layout_constraintEnd_toStartOf="@+id/guidelineMiddle"
         app:layout_constraintTop_toBottomOf="@+id/button5"
-        style="@style/ButtonNumbers"
-        android:text="@string/_2"/>
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_2"/>
 
     <Button
         android:id="@+id/button3"
@@ -167,8 +167,8 @@
         app:layout_constraintEnd_toStartOf="@+id/guidelineEnd"
         app:layout_constraintTop_toBottomOf="@+id/button6"
         app:layout_constraintBottom_toTopOf="@+id/imageButtonEqual"
-        style="@style/ButtonNumbers"
-        android:text="@string/_3"/>
+        style="@style/CCalcButtonNumbers"
+        android:text="@string/c_calc_3"/>
 
     <ImageButton
         android:id="@+id/imageButtonPlus"
@@ -176,8 +176,8 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/imageButtonMinus"
         tools:ignore="ContentDescription"
-        android:src="@drawable/ic_plus"
-        style="@style/ButtonOperations"
+        android:src="@drawable/c_calc_ic_plus"
+        style="@style/CCalcButtonOperations"
         android:layout_marginBottom="8dp"
         app:layout_constraintBottom_toBottomOf="parent"/>
 
@@ -187,7 +187,7 @@
         app:layout_constraintEnd_toStartOf="@+id/guidelineStart"
         app:layout_constraintTop_toBottomOf="@+id/button1"
         tools:text="."
-        style="@style/ButtonNumbers"
+        style="@style/CCalcButtonNumbers"
         app:layout_constraintBottom_toBottomOf="parent"/>
 
     <Button
@@ -195,8 +195,8 @@
         app:layout_constraintStart_toEndOf="@+id/guidelineStart"
         app:layout_constraintEnd_toStartOf="@+id/guidelineMiddle"
         app:layout_constraintTop_toBottomOf="@+id/button2"
-        android:text="@string/_0"
-        style="@style/ButtonNumbers"
+        android:text="@string/c_calc_0"
+        style="@style/CCalcButtonNumbers"
         app:layout_constraintBottom_toBottomOf="parent"/>
 
     <ImageButton
@@ -204,7 +204,7 @@
         app:layout_constraintTop_toBottomOf="@+id/button3"
         android:id="@+id/imageButtonEqual"
         app:layout_constraintBottom_toBottomOf="parent"
-        style="@style/ButtonEqual"
+        style="@style/CCalcButtonEqual"
         tools:ignore="ContentDescription"
         app:layout_constraintEnd_toStartOf="@+id/guidelineEnd"
         android:layout_marginEnd="8dp"/>
@@ -254,11 +254,11 @@
 
     <Button
         android:id="@+id/buttonCancel"
-        style="@style/ButtonCancel"/>
+        style="@style/CCalcButtonCancel"/>
 
     <Button
         android:id="@+id/buttonConfirm"
-        style="@style/ButtonConfirm"/>
+        style="@style/CCalcButtonConfirm"/>
   </LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/values/attrs.xml b/cravecalculator/src/main/res/values/attrs.xml
deleted file mode 100644
index 0d2c4cc..0000000
--- a/cravecalculator/src/main/res/values/attrs.xml
+++ /dev/null
@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-
-</resources>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/values/colors.xml b/cravecalculator/src/main/res/values/colors.xml
index ff3f9bf..6283575 100644
--- a/cravecalculator/src/main/res/values/colors.xml
+++ b/cravecalculator/src/main/res/values/colors.xml
@@ -1,18 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-  <color name="colorDisabled">#D3DADC</color>
-  <color name="colorRippleButton">#000000</color>
-  <color name="colorEqualButtonBackground">#0D2ECC71</color>
-  <color name="colorEqualButtonIcon">#2ECC71</color>
-  <color name="colorOperationsButtonBackground">#0DFD6A08</color>
-  <color name="colorOperationsButtonIcon">#FD6A08</color>
-  <color name="colorNumbersButtonBackground">@android:color/white</color>
-  <color name="colorNumbersButtonIcon">#2F313A</color>
-  <color name="colorConfirmButtonBackground">#FD6A08</color>
-  <color name="colorConfirmButtonText">@android:color/white</color>
-  <color name="colorCancelButtonBackground">@android:color/white</color>
-  <color name="colorCancelButtonText">#59636F</color>
-  <color name="colorOperationText">#2F313A</color>
-  <color name="colorPreviewText">#4D000000</color>
-  <color name="colorResultText">#2F313A</color>
+  <color name="cCalColorDisabled">#D3DADC</color>
+  <color name="cCalColorRippleButton">#000000</color>
+  <color name="cCalColorEqualButtonBackground">#0D2ECC71</color>
+  <color name="cCalColorEqualButtonIcon">#2ECC71</color>
+  <color name="cCalColorOperationsButtonBackground">#0DFD6A08</color>
+  <color name="cCalColorOperationsButtonIcon">#FD6A08</color>
+  <color name="cCalColorNumbersButtonBackground">@android:color/white</color>
+  <color name="cCalColorNumbersButtonIcon">#2F313A</color>
+  <color name="cCalColorConfirmButtonBackground">#FD6A08</color>
+  <color name="cCalColorConfirmButtonText">@android:color/white</color>
+  <color name="cCalColorCancelButtonBackground">@android:color/white</color>
+  <color name="cCalColorCancelButtonText">#59636F</color>
+  <color name="cCalColorOperationText">#2F313A</color>
+  <color name="cCalColorPreviewText">#4D000000</color>
+  <color name="cCalColorResultText">#2F313A</color>
 </resources>
\ No newline at end of file
diff --git a/cravecalculator/src/main/res/values/strings.xml b/cravecalculator/src/main/res/values/strings.xml
index da3a1e2..5264d36 100644
--- a/cravecalculator/src/main/res/values/strings.xml
+++ b/cravecalculator/src/main/res/values/strings.xml
@@ -1,21 +1,19 @@
 <resources>
-  <public />
+  <string name="c_calc_app_name">cravecalculator</string>
 
-  <string name="app_name">cravecalculator</string>
+  <string name="c_calc_point">.</string>
+  <string name="c_calc_0">0</string>
+  <string name="c_calc_1">1</string>
+  <string name="c_calc_2">2</string>
+  <string name="c_calc_3">3</string>
+  <string name="c_calc_4">4</string>
+  <string name="c_calc_5">5</string>
+  <string name="c_calc_6">6</string>
+  <string name="c_calc_7">7</string>
+  <string name="c_calc_8">8</string>
+  <string name="c_calc_9">9</string>
 
-  <string name="_point">.</string>
-  <string name="_0">0</string>
-  <string name="_1">1</string>
-  <string name="_2">2</string>
-  <string name="_3">3</string>
-  <string name="_4">4</string>
-  <string name="_5">5</string>
-  <string name="_6">6</string>
-  <string name="_7">7</string>
-  <string name="_8">8</string>
-  <string name="_9">9</string>
-
-  <string name="charge_customer">Charge Customer</string>
-  <string name="clear">C</string>
-  <string name="cancel">Cancel</string>
+  <string name="c_calc_charge_customer">Charge Customer</string>
+  <string name="c_calc_clear">C</string>
+  <string name="c_calc_cancel">Cancel</string>
 </resources>
diff --git a/cravecalculator/src/main/res/values/styles.xml b/cravecalculator/src/main/res/values/styles.xml
index 97cc9df..a2d2bf2 100644
--- a/cravecalculator/src/main/res/values/styles.xml
+++ b/cravecalculator/src/main/res/values/styles.xml
@@ -1,89 +1,89 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 
-  <style name="ButtonEqual">
+  <style name="CCalcButtonEqual">
     <item name="android:layout_width">0dp</item>
     <item name="android:layout_height">0dp</item>
-    <item name="android:background">@drawable/ripple_equal_button</item>
-    <item name="android:tint">@color/colorEqualButtonIcon</item>
-    <item name="android:textColor">@color/colorEqualButtonIcon</item>
-    <item name="android:src">@drawable/ic_equal</item>
+    <item name="android:background">@drawable/c_calc_ripple_equal_button</item>
+    <item name="android:tint">@color/cCalColorEqualButtonIcon</item>
+    <item name="android:textColor">@color/cCalColorEqualButtonIcon</item>
+    <item name="android:src">@drawable/c_calc_ic_equal</item>
     <item name="android:layout_margin">6dp</item>
   </style>
 
-  <style name="ButtonOperations">
+  <style name="CCalcButtonOperations">
     <item name="android:layout_width">0dp</item>
     <item name="android:layout_height">0dp</item>
-    <item name="android:background">@drawable/ripple_operations_button</item>
-    <item name="android:tint">@color/colorOperationsButtonIcon</item>
-    <item name="android:textColor">@color/colorOperationsButtonIcon</item>
+    <item name="android:background">@drawable/c_calc_ripple_operations_button</item>
+    <item name="android:tint">@color/cCalColorOperationsButtonIcon</item>
+    <item name="android:textColor">@color/cCalColorOperationsButtonIcon</item>
     <item name="android:layout_margin">6dp</item>
-    <item name="android:fontFamily">@font/lato_regular</item>
+    <item name="android:fontFamily">@font/c_calc_lato_regular</item>
     <item name="android:textAllCaps">false</item>
   </style>
 
-  <style name="ButtonNumbers">
+  <style name="CCalcButtonNumbers">
     <item name="android:layout_width">0dp</item>
     <item name="android:layout_height">0dp</item>
-    <item name="android:background">@drawable/ripple_numbers_button</item>
-    <item name="android:tint">@color/colorNumbersButtonIcon</item>
-    <item name="android:textColor">@color/colorNumbersButtonIcon</item>
+    <item name="android:background">@drawable/c_calc_ripple_numbers_button</item>
+    <item name="android:tint">@color/cCalColorNumbersButtonIcon</item>
+    <item name="android:textColor">@color/cCalColorNumbersButtonIcon</item>
     <item name="android:layout_margin">6dp</item>
     <item name="android:textSize">24sp</item>
-    <item name="android:fontFamily">@font/lato_regular</item>
+    <item name="android:fontFamily">@font/c_calc_lato_regular</item>
   </style>
 
-  <style name="ButtonConfirm">
+  <style name="CCalcButtonConfirm">
     <item name="android:layout_width">match_parent</item>
     <item name="android:layout_height">56dp</item>
     <item name="android:layout_weight">4</item>
-    <item name="android:background">@drawable/selector_confirm_button</item>
-    <item name="android:textColor">@color/colorConfirmButtonText</item>
+    <item name="android:background">@drawable/c_calc_selector_confirm_button</item>
+    <item name="android:textColor">@color/cCalColorConfirmButtonText</item>
     <item name="android:textSize">14sp</item>
-    <item name="android:text">@string/charge_customer</item>
+    <item name="android:text">@string/c_calc_charge_customer</item>
     <item name="android:maxLines">1</item>
     <item name="android:layout_marginStart">4dp</item>
-    <item name="android:fontFamily">@font/lato_semibold</item>
+    <item name="android:fontFamily">@font/c_calc_lato_semibold</item>
   </style>
 
-  <style name="ButtonCancel">
+  <style name="CCalcButtonCancel">
     <item name="android:layout_width">match_parent</item>
     <item name="android:layout_height">56dp</item>
     <item name="android:layout_weight">6</item>
     <item name="android:elevation">0dp</item>
-    <item name="android:background">@drawable/ripple_cancel_button</item>
-    <item name="android:textColor">@color/colorCancelButtonText</item>
+    <item name="android:background">@drawable/c_calc_ripple_cancel_button</item>
+    <item name="android:textColor">@color/cCalColorCancelButtonText</item>
     <item name="android:maxLines">1</item>
     <item name="android:textSize">14sp</item>
-    <item name="android:text">@string/cancel</item>
+    <item name="android:text">@string/c_calc_cancel</item>
     <item name="android:layout_marginEnd">4dp</item>
-    <item name="android:fontFamily">@font/lato_semibold</item>
+    <item name="android:fontFamily">@font/c_calc_lato_semibold</item>
   </style>
 
-  <style name="TextViewOperation">
+  <style name="CCalcTextViewOperation">
     <item name="android:layout_width">wrap_content</item>
     <item name="android:layout_height">wrap_content</item>
     <item name="android:textSize">24sp</item>
     <item name="android:layout_gravity">end</item>
     <item name="android:maxLines">1</item>
-    <item name="android:textColor">@color/colorOperationText</item>
-    <item name="android:fontFamily">@font/lato_regular</item>
+    <item name="android:textColor">@color/cCalColorOperationText</item>
+    <item name="android:fontFamily">@font/c_calc_lato_regular</item>
     <item name="android:textAlignment">textEnd</item>
   </style>
 
-  <style name="TextViewPreview">
+  <style name="CCalcTextViewPreview">
     <item name="android:layout_width">match_parent</item>
     <item name="android:layout_height">wrap_content</item>
     <item name="android:textSize">32sp</item>
     <item name="android:layout_gravity">end</item>
     <item name="android:gravity">end</item>
     <item name="android:maxLines">1</item>
-    <item name="android:textColor">@color/colorPreviewText</item>
-    <item name="android:fontFamily">@font/lato_regular</item>
+    <item name="android:textColor">@color/cCalColorPreviewText</item>
+    <item name="android:fontFamily">@font/c_calc_lato_regular</item>
     <item name="android:layout_marginBottom">16dp</item>
   </style>
 
-  <style name="TextViewResult" parent="TextViewPreview">
-    <item name="android:textColor">@color/colorResultText</item>
+  <style name="CCalcTextViewResult" parent="CCalcTextViewPreview">
+    <item name="android:textColor">@color/cCalColorResultText</item>
   </style>
 </resources>
\ No newline at end of file