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;
    }
};