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]: hrhhhhhbhrhhrb
[EX A]: hhhhh

[EX Q]: qqqqqqgqggqqqgg
[EX A]: ggqqqgg

[EX Q]: dbbbbbdbbb
[EX A]:
dbbbbbd