Leetcode：heap-buffer-overflow

用C语言做题遇到heap-buffer-overflow问题，以为是数组访问越界，百思不得其解。排查一番，问题出在未在字符串的末尾加上'\0'，加上就好了：

char * longestPalindrome(char * s){
    int maxLen = 1;
    int index = 0;
    int strLen = strlen(s);
    if (strLen == 1) return s;
    
    for (int i = 0; i < strLen; i++) {
        for(int j = i + 1; j < strLen; j++) {
            int ret = isPlalindrome(s, i, j);
            if (ret && j - i + 1 > maxLen) {
                maxLen = j - i + 1;
                index = i;
            }
        }
    }
    char *res = (char*)malloc(maxLen+1);
    memcpy(res, s+index, maxLen);
    res[maxLen] = '\0';

    return res;
}