https://leetcode.com/problems/greatest-common-divisor-of-strings/description/?envType=study-plan-v2&envId=leetcode-75 Greatest Common Divisor of Strings - LeetCode Can you solve this real interview question? Greatest Common Divisor of Strings - For two strings s and t, we say "t divides s" if and only if s = t + ... + t (i.e., t is concatenated with itself one or more times). Given two strings s..