Find words containing character

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::find_words_containing(sv(&["leet","code"]), 'e');
    let expected = vec![0, 1];
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let mut res = Solution::find_words_containing(sv(&["abc","bcd","aaaa","cbc"]), 'a');
    res.sort_unstable();
    let val = res;
    let expected = vec![0, 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::find_words_containing(sv(&["abc","bcd","aaaa","cbc"]), 'z');
    let expected = Vec::<i32>::new();
    log_result!(val == expected, "t3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t4() {
    let start = std::time::Instant::now();
    // all words contain 'a'
    let mut res = Solution::find_words_containing(sv(&["apple","banana","avocado"]), 'a');
    res.sort_unstable();
    let val = res;
    let expected = vec![0, 1, 2];
    log_result!(val == expected, "t4", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t5() {
    let start = std::time::Instant::now();
    // single word with character
    let val = Solution::find_words_containing(sv(&["hello"]), 'h');
    let expected = vec![0];
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t6() {
    let start = std::time::Instant::now();
    // single word without character
    let val = Solution::find_words_containing(sv(&["hello"]), 'z');
    let expected = Vec::<i32>::new();
    log_result!(val == expected, "t6", start, &expected, &val);
    assert_eq!(val, expected);
}