459\. Repeated Substring Pattern

Easy

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:**

*   <code>1 <= s.length <= 10<sup>4</sup></code>
*   `s` consists of lowercase English letters.