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]: xmxwwwxxxmwxmxw
[EX A]: xwwwx

[EX Q]: ojojoujouojoj
[EX A]: ojojo

[EX Q]: vhvhhvnhvv
[EX A]:
vhhv