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: tztzxzxtzxtzzt

A: tzzt
****
Q: yffyytttff

A: yffy
****
Q: utttttttttuttt

A:
utttttttttu
****
