pub fn parse_line(line: &str) -> (&str, Vec<&str>) {
    let tokens = line.trim().split(' ').collect::<Vec<&str>>();
    let mut args: Vec<&str> = Vec::new();
    let command = tokens[0];
    if tokens.len() > 1 {
        args = tokens[1..].to_vec();
    }
    (command, args)
}