use std::io;
use std::io::Write;

fn greet(person: &str) {
    println!("Hello, {}!", person);
}

fn main() {
    let mut input = String::new();

    loop {
        print!("Enter your name: ");
        std::io::stdout().flush().unwrap();

        match io::stdin().read_line(&mut input) {
            Ok(_) => {
                input = String::from(input.trim());
                break
            }
            Err(error) => {
                println!("error: {}", error);
                continue
            }
        }
    }

    greet(&input[..]);
}