Bevy: constant speed player navigation

bevy_navigation_constant_speed.rs

fn player_navigation(
    time: Res<Time>,
    mut player_query: Query<
        (
            &mut KinematicCharacterController,
            &mut Destination,
            &mut Transform,
        ),
        With<Player>,
    >,
) {
    let (mut player_controller, player_destination, player_transform) =
        player_query.get_single_mut().unwrap();

    let Some(destination) = player_destination.0 else {
        return;
    };

    let direction = (destination) - (player_transform.translation);
    let moving = 0.7 * direction.normalize() * time.delta_seconds();

    player_controller.translation = Some(moving);
}