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: xxiixixxgixiigi

A: xiix
****
Q: lljljljjjjjljj

A: jljjjjjlj
****
Q: tdtddttdltll

A:
tddt
****
