let delete_question = warp::delete()
        .and(warp::path("questions"))
        .and(warp::path::param::<String>())
        .and(warp::path::end())
        .and(store_filter.clone())
        .and_then(delete_question);
        
    let routes = get_questions
        .or(update_question)
        .or(add_question)
        .or(delete_question)
        .with(cors)
        .recover(return_error);
    ...
}
...