Find the child who has the ball after k seconds

#[test]
fn test_example1() {
    let start = std::time::Instant::now();
    let val = Solution::number_of_child(3, 5);
    let expected = 1;
    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::number_of_child(5, 6);
    let expected = 2;
    log_result!(val == expected, "test_example2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example3() {
    let start = std::time::Instant::now();
    let val = Solution::number_of_child(4, 2);
    let expected = 2;
    log_result!(val == expected, "test_example3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_full_cycle() {
    let start = std::time::Instant::now();
    let val = Solution::number_of_child(3, 4);
    let expected = 0;
    log_result!(val == expected, "test_full_cycle", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_k_zero_equivalent() {
    let start = std::time::Instant::now();
    let val = Solution::number_of_child(5, 8);
    let expected = 0;
    log_result!(val == expected, "test_k_zero_equivalent", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_last_child() {
    let start = std::time::Instant::now();
    let val = Solution::number_of_child(5, 4);
    let expected = 4;
    log_result!(val == expected, "test_last_child", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_n2() {
    let start = std::time::Instant::now();
    let val = Solution::number_of_child(2, 1);
    let expected = 1;
    log_result!(val == expected, "test_n2", start, &expected, &val);
    assert_eq!(val, expected);
}