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How to use Multiple .rs files

first.rs

fn first(){
    println!("{}","From first function");

}
fn main() {
    println!("Hello from first main file!");
    first();
}

second.rs

fn second(){
    println!("{}","From second function");

}

fn main() {
    println!("Hello from second main file!");
    second();
}

cargo run --bin first

cargo run --bin second
````<span id='footer-class'>Ver 2.0.9</span>
<footer id="last-change">Last change: 2026-02-04</footer>````