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]: zzzzyyyyzyzzzz
[EX A]: zyyyyz

[EX Q]: xwwwwwzxzww
[EX A]: wwzxzww

[EX Q]: xwxwllxwxwwwxwl
[EX A]:
wxwwwxw