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: sshfhffshssfh

A: hfh
****
Q: pbbbpxxxbxbb

A: pbbbp
****
Q: xgxggxxffgxxgf

A:
fgxxgf
****
