Rust ownership simple example. Run this on play.rust-lang.org and check the error. (from https://corrode.dev/blog/flattening-rusts-learning-curve)

main.rs

fn greet(name: String) {
    println!("hello {}", name)
}

fn main() {
    let first_name = String::from("Bob");
    greet(first_name);
    greet(first_name);
}