131. Palindrome Partitioning 
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Problem
Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s.
Example 1:
Input: s = "aab" Output: [["a","a","b"],["aa","b"]]
Example 2:
Input: s = "a" Output: [["a"]]
Constraints:
1 <= s.length <= 16scontains only lowercase English letters.