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.

Q: ccnnmncccmcn

A: nmn
****
Q: dddpppddpdpu

A: ddpppdd
****
Q: hfhfhfxhhxh

A:
hfhfh
****
