Reverse string | leetcode

思路：在原来的字符串后面添加上strlen-1个字符，返回

class Solution {public:    string reverseString(string s) {        unsigned int strlen;        int i;        // char temp;                strlen = s.size();        if (strlen > 1) {            for (i = strlen - 2; i >= 0 ; i--)   {                // temp = s[i];                s += s[i];            }            return s.substr(strlen - 1 , strlen + strlen - 2);        }        else            return s;    }};