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: gdgaggdaggg

Answer: gdg


Question: jmmmzjzjjzmmm

Answer: zjjz


Question: dddddqddqdd

Answer:
ddqddqdd