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1function longestPalindrome(s) {
2  if (!s) return "";
3  let start = 0, end = 0;
4
5  for (let i = 0; i < s.length; i++) {
6    let len1 = expandAroundCenter(s, i, i);
7    let len2 = expandAroundCenter(s, i, i + 1);
8    let len = Math.max(len1, len2);
9
10    if (len > end - start) {
11      start = i - Math.floor((len - 1) / 2);
12      end = i + Math.floor(len / 2);
13    }
14  }
15  return s.substring(start, end + 1);
16}