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: twwntwnnnttwnw

A: nnn
****
Q: gyykyggggykyky

A: ykyggggyky
****
Q: fffhhhfhhww

A:
fhhhf
****
