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]: yyllyylhyyyl
[A]: yyllyy


[Q]: hhghhghhmmmggm
[A]: hhghhghh


[Q]: aahuaaahauhhhua
[A]:
auhhhua


