package mainimport ( "fmt")func reverse(s string) string { s1 := []rune(s) for i := 0; i < len(s1)/2; i++ { tmp := s1[i] s1[i] = s1[len(s1)-1-i] s1[len(s1)-1-i] = tmp } return string(s1)}func main() { s := "123456" fmt.Println(reverse(s))}