pub async fn command() -> Result<(), String> {

    println!("Fetching installed apps...");

    let (installed_app_ids, apps) = future::join(Protontricks::apps(), API.apps()).await;

    let apps = apps

        .iter()

        .filter(|app| installed_app_ids.contains(&app.id));

    for app in apps {

        println!("{0} ({1})", app.name, app.id);

    }

    Ok(())

}