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: yyuuuyuueyeuu

SOLUTION: uueyeuu

PROBLEM: ttvsvvvssst

SOLUTION: svvvs

PROBLEM: zzyyzeyyeeyyeyz

SOLUTION:
eyyeeyye