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: xnnxxxxnxx

SOLUTION: nxxxxn

PROBLEM: mlrrrrrmmmllrr

SOLUTION: rrrrr

PROBLEM: aqaaqbqbqaa

SOLUTION:
aaqbqbqaa