fix: coding style and file format.

eBook/exercises/chapter_4/count_characters.go

@@ -14,6 +14,7 @@ func main() {
 	fmt.Printf("The number of bytes in string str2 is %d\n", len(str2))
 	fmt.Printf("The number of characters in string str2 is %d", utf8.RuneCountInString(str2))
 }
+
 /* Output:
 The number of bytes in string str1 is 22
 The number of characters in string str1 is 22

eBook/exercises/chapter_4/function_calls_function.go

@@ -15,4 +15,5 @@ func f1() {
 func f2() {
 	print(a) // global variable is taken
 }
+
 // GOG

eBook/exercises/chapter_4/global_scope.go

@@ -16,4 +16,5 @@ func m() {
 	a = "O" // simple assignment: global a gets a new value
 	print(a)
 }
+
 // GOO

eBook/exercises/chapter_4/local_scope.go

@@ -14,4 +14,5 @@ func m() {
 	a := "O" // new local variable a is declared
 	print(a)
 }
+
 // GOG