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]: iiiaiiaiaaiz
[EX A]: iaiiai

[EX Q]: tttcccoctoo
[EX A]: ttt

[EX Q]: titjitjjjijti
[EX A]:
tit