use std::collections::HashMap;
fn main() {
    let keywords: HashMap<String, String> =
    [(String::from("hello"), String::from("world"))]
     .iter().cloned().collect();

    let s: String = match keywords.get("hello") {
        Some(word) => word.to_string(),
        None => "None".to_string(),
    };
    println!("{}", s);
}