update book code

eBook/exercises/chapter_13/string_reverse.go

@@ -0,0 +1,18 @@
+// string_reverse.go
+package strev
+
+func Reverse(s string) string {
+	runes := []rune(s)
+	n, h := len(runes), len(runes)/2
+	for i := 0; i < h; i++ {
+		runes[i], runes[n-1-i] = runes[n-1-i], runes[i]
+	}
+	return string(runes)
+}
+
+/*
+func main() {
+	s := "My Test String!"
+	fmt.Println(s, " --> ", Reverse(s))
+}
+*/