Extra characters in a string

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::min_extra_char("leetscode".to_string(), vec!["leet".to_string(), "code".to_string(), "leetcode".to_string()]);
    let expected = 1;
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let val = Solution::min_extra_char("sayhelloworld".to_string(), vec!["hello".to_string(), "world".to_string()]);
    let expected = 3;
    log_result!(val == expected, "t2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t3() {
    let start = std::time::Instant::now();
    let val = Solution::min_extra_char("abc".to_string(), vec!["abc".to_string()]);
    let expected = 0;
    log_result!(val == expected, "t3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t4() {
    let start = std::time::Instant::now();
    let val = Solution::min_extra_char("abc".to_string(), vec!["a".to_string(), "b".to_string(), "c".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::min_extra_char("zzz".to_string(), vec!["a".to_string()]);
    let expected = 3;
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t6() {
    let start = std::time::Instant::now();
    let val = Solution::min_extra_char("abcd".to_string(), vec!["ab".to_string(), "cd".to_string()]);
    let expected = 0;
    log_result!(val == expected, "t6", start, &expected, &val);
    assert_eq!(val, expected);
}