println!("part two: {}", part_two(&input));

    traverse(input, 3, 1)
}
fn part_two(input: &Vec<Vec<char>>) -> u32 {
    let trajectories = [[1, 1], [3, 1], [5, 1], [7, 1], [1, 2]];
    trajectories.iter().fold(1, |product, trajectory| product * traverse(input, trajectory[0], trajectory[1]))
}
fn traverse(input: &Vec<Vec<char>>, right: usize, down: usize) -> u32 {

        x += 3;
        y += 1;

        x += right;
        y += down;

}
#[test]
fn test_part_two() {
    let input = read_input("test_input.txt");
    assert_eq!(part_two(&input), 336)