TASK DEFINITION: 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.
PROBLEM: aadadtaatda

SOLUTION: adtaatda

PROBLEM: uuuguugguuuuug

SOLUTION: guuuuug

PROBLEM: lldfllddlffffff

SOLUTION:
ffffff