344. 反转字符串

编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 char[] 的形式给出。

不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。

示例 1：

输入：["h","e","l","l","o"]
输出：["o","l","l","e","h"]
示例 2：

输入：["H","a","n","n","a","h"]
输出：["h","a","n","n","a","H"]

public class Solution {
    public void ReverseString(char[] s) {
        int slength = s.Length;
            for (int i = 0; i < (slength / 2); i++)
            {
                char temp = s[slength - i - 1];
                s[slength - i - 1] = s[i];
                s[i] = temp;
            }
    }
}