Nim game

#[test]
fn test_example_1_lose_with_4() {
    let start = std::time::Instant::now();
    let val = Solution::can_win_nim(4);
    let expected = false;
    log_result!(val == expected, "test_example_1_lose_with_4", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example_2_win_with_1() {
    let start = std::time::Instant::now();
    let val = Solution::can_win_nim(1);
    let expected = true;
    log_result!(val == expected, "test_example_2_win_with_1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example_3_win_with_2() {
    let start = std::time::Instant::now();
    let val = Solution::can_win_nim(2);
    let expected = true;
    log_result!(val == expected, "test_example_3_win_with_2", start, &expected, &val);
    assert_eq!(val, expected);
}