Longest Palindromic Substring
Given a string s, return the longest palindromic substring in s.
Longest Palindromic Substring

Given a string s, return the longest palindromic substring in s.

Example 1:
Input: "babad"
Output: "bab"
Input
arr ="babad"

Expand around each center

babadbTFFFFaFTFFFbFFTFFaFFFTFdFFFFT
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