题目网址:https://leetcode.cn/leetbook/read/top-interview-questions-easy/xnhbqj/
public class Solution {
public void ReverseString(char[] s) {
int len = s.Length;
for(int i = 0; i < len / 2; i++)
{
char k = s[i];
s[i] = s[len - 1 - i];
s[len - 1 - i] = k;
}
}
}