Break a Palindrome
Given a palindromic string
palindrome, replace exactly one character by any lowercase English letter so that the string becomes the lexicographically smallest possible string that isn't a palindrome.
After doing so, return the final string. If there is no way to do so, return the empty string.
palindrome = "abccba"
palindrome = "a"
1 <= palindrome.length <= 1000
palindromeconsists of only lowercase English letters.