Reverse words in a string iii

#[test]
fn test_example1() {
    let start = std::time::Instant::now();
    let val = Solution::reverse_words("Let's take LeetCode contest".to_string());
    let expected = "s'teL ekat edoCteeL tsetnoc".to_string();
    log_result!(val == expected, "test_example1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example2() {
    let start = std::time::Instant::now();
    let val = Solution::reverse_words("Mr Ding".to_string());
    let expected = "rM gniD".to_string();
    log_result!(val == expected, "test_example2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_numbers_and_letters() {
    let start = std::time::Instant::now();
    let val = Solution::reverse_words("abc def ghi".to_string());
    let expected = "cba fed ihg".to_string();
    log_result!(val == expected, "test_numbers_and_letters", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_palindrome_words() {
    let start = std::time::Instant::now();
    let val = Solution::reverse_words("racecar level".to_string());
    let expected = "racecar level".to_string();
    log_result!(val == expected, "test_palindrome_words", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_single_word() {
    let start = std::time::Instant::now();
    let val = Solution::reverse_words("hello".to_string());
    let expected = "olleh".to_string();
    log_result!(val == expected, "test_single_word", start, &expected, &val);
    assert_eq!(val, expected);
}