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]: vvnvnvvrrvnvrvn
[EX A]: vvnvnvv

[EX Q]: twtewtwtwwtte
[EX A]: wtwtw

[EX Q]: jmkjjmjjkjkkm
[EX A]:
kjjmjjk