instruction:
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:
huuruuruuru
answer:
uruuruuru


question:
oxxoxoxxxxx
answer:
xxoxoxx


question:
cxxcxccxxxxxcxc
answer:

cxxxxxc


