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.

[EX Q]: ncaaanaancacac
[EX A]: aanaa

[EX Q]: tdtedtettddee
[EX A]: tdt

[EX Q]: xfxfftxttxftt
[EX A]:
xttx