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Greatest Common Divisor of Strings
For two strings s and t, we say "t divides s" if and only if s = t + t + t + ...
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: ""
Constraints
- 1 <= str1.length, str2.length <= 1000
- str1 and str2 consist of English uppercase letters.
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