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: ntgtnngtggttt

A: ntgtn
****
Q: fmmnnmmfmnfm

A: fmmnnmmf
****
Q: sfbbfsssfffsbb

A:
sfbbfs
****