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]: gvvvgvyvyy
[EX A]: gvvvg

[EX Q]: mjmmjmmmmm
[EX A]: mjmmjm

[EX Q]: kwwwukkkuu
[EX A]:
ukkku