Rust Error Handling

error_handling.rs

fn main() {
    let x: Option<&str> = Some("some");
    println!("{:?}", x);
    println!("{:?}", x.unwrap());

    match x {
        Some(v) => {
            println!("v = {:?}", v);
        }
        None => {
            println!("v is none");
        }
    }

    let y: Option<&str> = None;

    match y {
        Some(v) => {
            println!("y = {:?}", v);
        }
        None => {
            println!("y is none");
        }
    }

    match get_status("clivern") {
        Ok(txt) => {
            println!("txt = {:?}", txt);
        }
        Err(er) => {
            println!("er = {:?}", er);
        }
    }

    match get_status("saml") {
        Ok(txt) => {
            println!("txt = {:?}", txt);
        }
        Err(er) => {
            println!("er = {:?}", er.as_str());
        }
    }

    println!("op!");

    get_status("df").expect("the code will panic!");

    println!("po!");
}

fn get_status(username: &str) -> Result<&str, String> {
    if username == "clivern" {
        Ok("clivern found")
    } else {
        Err(format!("{} is not found", username))
    }
}

https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=dad017be9abde316076206fc20147d3e