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: ctqccctqqqctct

A: ccc
****
Q: nnsntstttt

A: tttt
****
Q: fxffxxiiffiii

A:
iiffii
****
