In this task you will be given a string and you should find the longest substring that is a palindrome. A palindrome is a string that is the same backwards as it is forwards. If the shortest possible palindrome is length 1 you should return the first character.

Q: xghghxghxxhxg

A: hxxh
****
Q: xfxfftxttxftt

A: xttx
****
Q: iiyiyiyiiiiyiyi

A:
iyiyiiiiyiyi
****
