Day 41: LeetCode 316 [Remove Duplicate Letters]
Problem Description: Given a string s, remove duplicate letters so that every letter appears once and only once. You must make sure your result is the smallest in lexicographical order among all possible results.
Example 1: Input: s = "bcabc" Output: "abc"
Link to LeetCode Problem: https://leetcode.com/problems/remove-duplicate-letters/description/
Thought Process:
wasn`t able to solve without reference
