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.

[EX Q]: hhwwhwiwwhi
[EX A]: hwwh

[EX Q]: sssossocoo
[EX A]: ssoss

[EX Q]: sozozozoozzo
[EX A]:
ozozozo