let rest = args.rest();

    let rest = args.rest().to_lowercase();

    let rest = convert_multiple_chars_to_emoji(&rest);

}
pub fn convert_multiple_chars_to_emoji(message: &str) -> String {
    let equivalence = [
        ("1234", "🔢"),
        ("cool", "🆒"),
        ("free", "🆓"),
        ("abcd", "🔠"),
        ("100", "💯"),
        ("abc", "🔤"),
        ("zzz", "💤"),
        ("sos", "🆘"),
        ("up!", "🆙"),
        ("new", "🆕"),
        ("ab", "🆎"),
        ("ng", "🆖"),
        ("vs", "🆚"),
        ("cl", "🆑"),
        ("ok", "🆗"),
        ("id", "🆔"),
        ("10", "🔟"),
    ];
    let mut result = message.to_string();
    for (base, emoji) in equivalence.iter() {
        if !result.contains(emoji) {
            if let Some((start, end)) = result.split_once(base) {
                result = format!("{}{}{}", start, emoji, end);
            }
        }
    }
    result

#![feature(str_split_once)]