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: uullulluul

A: uullulluu
****
Q: nxxixinniixixxn

A: inni
****
Q: tnncnnnttttnttt

A:
tttnttt
****
