Method parse_cmd

examples/final.rs:92–112

(
        binary: &'a str,
        tokens: &mut Peekable<I>,
    )

    }

    fn parse_cmd<I: Iterator<Item = &'a str>>(
        binary: &'a str,
        tokens: &mut Peekable<I>,
    ) -> Option<Cmd<'a>> {
        let mut args: Vec<&str> = vec![];
        loop {
            let next = tokens.peek();
            match next {
                Some(token) if Self::is_operator(token) => {
                    // found operator, so I already parsed all cmd
                    break;
                }
                Some(token) => {
                    args.push(token);
                }
                None => break,
            }
            tokens.next();
        }
        Some(Cmd { binary, args })
    }
}

impl<'a> Cmd<'a> {