#[tokio::main]
async fn main() {
    let store = Store::new();
    let store_filter = warp::any().map(move || store.clone());

    ...

    let add_answer = warp::post()
        .and(warp::path("answers"))
        .and(warp::path::end())
        .and(store_filter.clone())
        .and(warp::body::form())
        .and_then(add_answer);
        
    let routes = get_questions
        .or(update_question)
        .or(add_question)
        .or(add_answer)
        .or(delete_question)
        .with(cors)
        .recover(return_error);