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;
}
}
}
