#[cfg(test)]
mod tests;

pub fn to_readable_str(mut val: usize) -> String {
    let mut groups = vec![];
    loop {
        let group = val % 1000;

        val /= 1000;

        if val == 0 {
            groups.push(group.to_string());
            break;
        } else {
            groups.push(format!("{group:03}"));
        }
    }

    groups.reverse();

    groups.join("_")
}