Fix Kotlin files

src/kotlin/ExponentiationRecursive.kt

@@ -9,13 +9,15 @@
  *
  * @return will return the *base* number raised by the *exponent*. The function returns a value of type *Long*.
  */
-fun exponentiationRecursive(base: Int, exponent: Int): Long {
-    return if (exponent === 0) {
+fun exponentiationRecursive(
+    base: Int,
+    exponent: Int,
+): Long =
+    if (exponent === 0) {
         1
-    }; else {
+    } else {
         base * exponentiationRecursive(base, exponent - 1)
     }
-}
 
 fun main() {
     println(exponentiationRecursive(2, 3))

src/kotlin/FibonacciRecursive.kt

@@ -8,13 +8,12 @@
  *
  * @return will return a logical condition if *number* is less than or equal to 1, returns 1 otherwise, the sum of itself using the concept of *recursion* to execute this sum.
  */
-fun fibonacci(number: Int): Int {
-    return if (number <= 1) {
+fun fibonacci(number: Int): Int =
+    if (number <= 1) {
         1
-    }; else {
+    } else {
         fibonacci(number - 1) + fibonacci(number - 2)
     }
-}
 
 fun main() {
     println(fibonacci(5))

src/kotlin/MergeSort.kt

@@ -10,7 +10,10 @@ fun mergeSort(arr: IntArray): IntArray {
     return merge(mergeSort(left), mergeSort(right))
 }
 
-fun merge(left: IntArray, right: IntArray): IntArray {
+fun merge(
+    left: IntArray,
+    right: IntArray,
+): IntArray {
     var result = IntArray(left.size + right.size)
     var leftIndex = 0
     var rightIndex = 0