rank_reason.rs

fn rank_reason(criteria: &mut HashMap<&str, bool>) -> String {
    let reason;
    let passes = rank_passes(criteria);
    if passes == 0 {
        reason = "none".to_string();
    } else {
        let mut ss = Vec::new();
        for (&k, &v) in criteria.iter() {
            if v {
                ss.push(k.clone());
            }
        }
        let joined = ss.join(" | ");
        reason = joined.to_string();
    }
    return reason;
}