Count vowels permutation

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::count_vowel_permutation(1);
    let expected = 5;
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let val = Solution::count_vowel_permutation(2);
    let expected = 10;
    log_result!(val == expected, "t2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t3() {
    let start = std::time::Instant::now();
    let val = Solution::count_vowel_permutation(5);
    let expected = 68;
    log_result!(val == expected, "t3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t4() {
    let start = std::time::Instant::now();
    let val = Solution::count_vowel_permutation(4);
    let expected = 35;
    log_result!(val == expected, "t4", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t5() {
    let start = std::time::Instant::now();
    let val = Solution::count_vowel_permutation(3);
    let expected = 19;
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}