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.
--------
Question: vnanvavnan

Answer: nanvavnan


Question: hhwwhwiwwhi

Answer: hwwh


Question: vwvvwvwwvv

Answer:
vwvvwv


