fix insertion sort error and reformat file

sorts/insertion_sort.go

@@ -3,19 +3,19 @@ package main
 import "fmt"
 
 func main() {
-	arr:= [9]int{2,1,4,3,5,9,7,6,8}
+	arr := [9]int{2, 1, 4, 3, 5, 9, 7, 6, 8}
 
-	for out:=1; out<len(arr); out++{
-		temp:=arr[out]
+	for out := 1; out < len(arr); out++ {
+		temp := arr[out]
 		in := out
 
-		for;in>0 && arr[in-1]>=temp;in--{
+		for ; in > 0 && arr[in-1] >= temp; in-- {
 			arr[in] = arr[in-1]
 		}
 		arr[in] = temp
 	}
 
-	for sortedvals:= range arr{
+	for _, sortedvals := range arr {
 		fmt.Println(sortedvals)
 	}
 }