Repeated substring pattern

#[test]
fn t1() {
    let s = std::time::Instant::now();
    let v = Solution::repeated_substring_pattern("abab".to_string());
    log_result!(v, "t1", s, true, v);
    assert!(v);
}

#[test]
fn t2() {
    let s = std::time::Instant::now();
    let v = Solution::repeated_substring_pattern("aba".to_string());
    log_result!(!v, "t2", s, false, v);
    assert!(!v);
}

#[test]
fn t3() {
    let s = std::time::Instant::now();
    let v = Solution::repeated_substring_pattern("abcabcabcabc".to_string());
    log_result!(v, "t3", s, true, v);
    assert!(v);
}

#[test]
fn t4() {
    let s = std::time::Instant::now();
    let v = Solution::repeated_substring_pattern("a".to_string());
    log_result!(!v, "t4", s, false, v);
    assert!(!v);
}

#[test]
fn t5() {
    let s = std::time::Instant::now();
    let v = Solution::repeated_substring_pattern("aaaa".to_string());
    log_result!(v, "t5", s, true, v);
    assert!(v);
}