Given an array of strings words, return the smallest string that contains each string in words as a substring. If there are multiple valid strings of the smallest length, return any of them.
You may assume that no string in words is a substring of another string in words.
Example 1:
Input: words = ["alex","loves","leetcode"] Output: "alexlovesleetcode" Explanation: All permutations of "alex","loves","leetcode" would also be accepted.
Example 2:
Input: words = ["catg","ctaagt","gcta","ttca","atgcatc"] Output: "gctaagttcatgcatc"
Constraints:
1 <= words.length <= 121 <= words[i].length <= 20words[i]consists of lowercase English letters.- All the strings of
wordsare unique.