source: https://leetcode.com/problems/find-smallest-letter-greater-than-target/description/ Find Smallest Letter Greater Than Target Table of ContentsFind Smallest Letter Greater Than TargetDescriptionExample 1:Example 2:Example 3:Constraints:Solution Description You are given an array of characters letters that is sorted in non-decreasing order, and a character target. There are at least two different characters in letters. Return the smallest character in letters that is ...