greatest-common-divisor-of-strings

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Overview

1071 For two strings s and t, we say "t divides s" if and only if s = t + t + t + ... + t + t (i.e., t is concatenated with itself one or more times).

Given two strings str1 and str2, return the largest string x such that x divides both str1 and str2.

Example 1:

Input: str1 = "ABCABC", str2 = "ABC" Output: "ABC" Example 2:

Input: str1 = "ABABAB", str2 = "ABAB" Output: "AB" Example 3:

Input: str1 = "LEET", str2 = "CODE" Output: ""