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: ggjjzzzggjz

SOLUTION: zzz

PROBLEM: jjyyjyyrry

SOLUTION: yyjyy

PROBLEM: aeaeeeaaawae

SOLUTION:
aeeea