diff --git a/.github/workflows/docker-build-test.yaml b/.github/workflows/docker-build-test.yaml
index bdd5393..03c770e 100644
--- a/.github/workflows/docker-build-test.yaml
+++ b/.github/workflows/docker-build-test.yaml
@@ -41,7 +41,8 @@ jobs:
           shell: bash
           options: -v ${{ github.workspace }}:/home/user/flexxlam_sdk
           run: |
-            mkdir ~/flexxlam_sdk/build && \
+            rm -rf ~/flexxlam_sdk/build && \
+            mkdir -p ~/flexxlam_sdk/build && \
             cd ~/flexxlam_sdk/build && \
             cmake .. && \
             make -j
@@ -57,7 +58,8 @@ jobs:
           shell: bash
           options: -v ${{ github.workspace  }}:/home/user/flexxlam_sdk
           run: |
-            mkdir ~/flexxlam_sdk/build && \
+            rm -rf ~/flexxlam_sdk/build && \
+            mkdir -p ~/flexxlam_sdk/build && \
             cd ~/flexxlam_sdk/build && \
             cmake -Dtest=true .. && \
             make -j && \
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8c3672a..6317bc3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,7 @@ option(test "Build unit tests." OFF)
 
 set(INSTALL_STATIC "Install static library" ON)
 set(INSTALL_SHARED "Install shared library" ON)
+set(BUILD_EXAMPLES "Build examples" ON)
 
 set (CPACK_PACKAGE_NAME ${PROJECT_NAME})
 set (CPACK_PACKAGE_DESCRIPTION_SUMMARY "FlexXlam SDK")
@@ -107,7 +108,9 @@ if (INSTALL_SHARED)
 endif()
 
 # Examples
-add_subdirectory(examples/client)
+if (BUILD_EXAMPLES)
+  add_subdirectory(examples/client)
+endif()
 
 # Unit test
 if (test)
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 13eab42..c74bd41 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -44,7 +44,7 @@ RUN git clone https://github.com/google/glog.git -b v0.6.0 && \
     sudo cmake --build build --target install
 
 # Install formatter, linter
-RUN sudo apt-get install -y python3-pip cppcheck flex bison libserial-dev graphviz
+RUN sudo apt-get install -y python3-pip cppcheck flex bison libserial-dev graphviz libgtest-dev
 RUN python3 -m pip install cpplint clang-format
 RUN git clone https://github.com/doxygen/doxygen.git -b Release_1_9_8 \
     && mkdir -p doxygen/build \
diff --git a/docker/Dockerfile.aarch64 b/docker/Dockerfile.aarch64
index bd4069c..846f7a7 100644
--- a/docker/Dockerfile.aarch64
+++ b/docker/Dockerfile.aarch64
@@ -44,7 +44,7 @@ RUN git clone https://github.com/google/glog.git -b v0.6.0 && \
     sudo cmake --build build --target install
 
 # Install formatter, linter
-RUN sudo apt-get install -y python3-pip cppcheck flex bison libserial-dev
+RUN sudo apt-get install -y python3-pip cppcheck flex bison libserial-dev libgtest-dev
 RUN python3 -m pip install cpplint clang-format
 
 RUN sudo usermod -aG dialout user
diff --git a/examples/client/flexxlam_client_example.cpp b/examples/client/flexxlam_client_example.cpp
index 763b444..d49bf0c 100644
--- a/examples/client/flexxlam_client_example.cpp
+++ b/examples/client/flexxlam_client_example.cpp
@@ -14,7 +14,6 @@
 #include <protocol/request/request_ethernet_communication_config.hpp>
 #include <protocol/request/request_mavlink_communication_config.hpp>
 #include <protocol/request/request_serial_communication_config.hpp>
-#include <utils/string_utils.hpp>
 
 namespace flexxlam {
 
diff --git a/include/protocol/command/command_save_pcd_protocol.hpp b/include/protocol/command/command_save_pcd_protocol.hpp
index e482a67..c14a26e 100644
--- a/include/protocol/command/command_save_pcd_protocol.hpp
+++ b/include/protocol/command/command_save_pcd_protocol.hpp
@@ -11,7 +11,6 @@
 #include <vector>
 
 #include "protocol/base_protocol.hpp"
-#include "utils/string_utils.hpp"
 #include "utils/to_bytes.hpp"
 
 namespace flexxlam {