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.

rhmmrhhhhrrh
rhhhhr
The given string is 'rhmmrhhhhrrh'.\nThere are two palindromes in the given string: 'r' and 'rhhhhr'.\nThe longest substring that is a palindrome is 'rhhhhr', with the length 6..