Merge pull request kodecocodes#984 from denizcoskun/patch-1

declare 'index' as variable

Author: kelvinlauKL

Insertion Sort/InsertionSort.swift

@@ -28,14 +28,13 @@ func insertionSort<T: Comparable>(_ array: [T]) -> [T] {
     guard array.count > 1 else { return array }
 
     var sortedArray = array
-    for index in 1..<sortedArray.count {
-        var currentIndex = index
-        let temp = sortedArray[currentIndex]
-        while currentIndex > 0, temp < sortedArray[currentIndex - 1] {
-            sortedArray[currentIndex] = sortedArray[currentIndex - 1]
-            currentIndex -= 1
+    for var index in 1..<sortedArray.count {
+        let temp = sortedArray[index]
+        while index > 0, temp < sortedArray[index - 1] {
+            sortedArray[index] = sortedArray[index - 1]
+            index -= 1
         }
-        sortedArray[currentIndex] = temp
+        sortedArray[index] = temp
     }
     return sortedArray
 }