Given a string s, check if it can be constructed by taking a substring of it and appending multiple copies of the substring together.

  Example 1:

Input: s = "abab" Output: true Explanation: It is the substring "ab" twice.

Example 2:

Input: s = "aba" Output: false

Example 3:

Input: s = "abcabcabcabc" Output: true Explanation: It is the substring "abc" four times or the substring "abcabc" twice.

  Constraints:

1 <= s.length <= 10⁴
s consists of lowercase English letters.