https://leetcode.com/problems/longest-palindrome/public class Solution {    public int longestPalindrome(String s) {        char []charr = s.toCharArray();        Arrays.sort(charr);        int result = 0;        for (int i=0; i<charr.length; i++) {            if (i==charr.length-1) {                break;            }            if (charr[i] == charr[i+1]) {                result += 2;                i++;            }        }        if (result < charr.length) {            result++;        }        return result;    }}