.add_systems(Startup, setup_camera)

        .add_systems(Startup, spawn)

fn setup_camera(mut commands: Commands) {

fn spawn(mut commands: Commands) {

    commands
        .spawn(SpriteBundle {
            sprite: Sprite {
                color: SNAKE_HEAD_COLOR,
                ..default()
            },
            transform: Transform {
                scale: Vec3::new(10.0, 10.0, 10.0),
                ..default()
            },
            ..default()
        })
        .insert(SnakeHead);

const SNAKE_HEAD_COLOR: Color = Color::srgb(0.7, 0.7, 0.7);