unsafe_c.rs

use std::env;

fn main() {
    let argsv: Vec<String> = env::args().collect();

    match argsv.len() {
        0 | 1 => {},
        2 | _ => {
            let arg = argsv[1].as_str();

            if arg == "CAT" {
                println!("Meow");
            } else if arg == "DOG" {
                println!("Woof");
            }
        }
    }
}