fix: coding style and file format for chapter 7.

eBook/exercises/chapter_7/for_array.go

@@ -9,5 +9,4 @@ func main() {
 	}
 	fmt.Println(arr) // [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14]
 
-
 }

eBook/exercises/chapter_7/map_function.go

@@ -18,7 +18,7 @@ func main() {
 	fmt.Printf("%v", mapFunc(mf, list))
 }
 
-func mapFunc(mf func(int) int, list []int) ([]int) {
+func mapFunc(mf func(int) int, list []int) []int {
 	result := make([]int, len(list))
 	for ix, v := range list {
 		result[ix] = mf(v)

eBook/exercises/chapter_7/string_reverse.go

@@ -34,6 +34,7 @@ func main() {
 	s := "My Test String!"
 	fmt.Println(s, " --> ", reverse(s))
 }
+
 /* Output:
 The reversed string is -elgooG-
 The reversed string is -elgooG-

eBook/exercises/chapter_7/string_split2.go

@@ -12,4 +12,5 @@ func Split2(s string) string {
 	mid := len(s) / 2
 	return s[mid:] + s[:mid]
 }
+
 // Output: The string Google transformed is: gleGoo

eBook/exercises/chapter_7/sum_array.go

@@ -36,4 +36,3 @@ func SumAndAverage (a []int) (int, float32) {
 	}
 	return sum, float32(sum / len(a))
 }
-