Number of strings that appear as substrings in word

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::num_of_strings(s(vec!["a","abc","bc","d"]), "abc".to_string());
    let expected = 3;
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let val = Solution::num_of_strings(s(vec!["a","b","c"]), "aaaaabbbbb".to_string());
    let expected = 2;
    log_result!(val == expected, "t2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t3() {
    let start = std::time::Instant::now();
    let val = Solution::num_of_strings(s(vec!["a","a","a"]), "ab".to_string());
    let expected = 3;
    log_result!(val == expected, "t3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t4() {
    let start = std::time::Instant::now();
    let val = Solution::num_of_strings(s(vec!["x"]), "abc".to_string());
    let expected = 0;
    log_result!(val == expected, "t4", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t5() {
    let start = std::time::Instant::now();
    let val = Solution::num_of_strings(s(vec!["abc"]), "abc".to_string());
    let expected = 1;
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}