//编写函数reverse(s),将字符串s中的字符顺序颠倒过来
//Write a function reverse(s) that reverses the character string s . Use it to write a //Write a
//编写函数reverse(s),将字符串s中的字符顺序颠倒过来
//Write a function reverse(s) that reverses the character string s . Use it to write a //Write a