async fn get_questions(
    params: HashMap<String, String>,
    store: Store,
) -> Result<impl warp::Reply, warp::Rejection> {

    if let Some(n) = params.get("start") {
        println!("{}", n);
    }
    match params.get("start") {
        Some(start) => println!("{}", start),
        None => println!("No start value"),
    }
    ...
}
...