Number of 1 bits

#[test]
fn test_hamming_weight_11() {
    let start = std::time::Instant::now();
    let val = Solution::hamming_weight(11);
    let expected = 3;
    log_result!(val == expected, "test_hamming_weight_11", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_hamming_weight_128() {
    let start = std::time::Instant::now();
    let val = Solution::hamming_weight(128);
    let expected = 1;
    log_result!(val == expected, "test_hamming_weight_128", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_hamming_weight_large() {
    let start = std::time::Instant::now();
    let val = Solution::hamming_weight(2147483645);
    let expected = 30;
    log_result!(val == expected, "test_hamming_weight_large", start, &expected, &val);
    assert_eq!(val, expected);
}