// Copyright 2026 Amber Hu

fn main() {
    let greeting = "你好,";  // hmmm
    let name = std::env::args().nth(1)
        .expect("Did not provide name"); 
    println!("{greeting} {name}!");

    // Mutating a variable requires it to be marked mut
    greeting = "再見,";
    println!("{greeting} {name}!");
}