mod day1 {

    pub(crate) fn day() -> &'static str {
        super::utils::dayname(5) }
}

mod utils {
    pub(crate) fn dayname(n: usize) -> &'static str {
        [
            "Monday",
            "Tuesday",
            "Wednesday",
            "Thursday",
            "Friday",
            "Saturday",
            "Sunday",
        ][n]
    }
}

fn main() {
    println!("{}", day1::day())
}