preferences::acquaintance* add_friend(const std::string& nick, const std::string& notes) {
    if(!utils::isvalid_wildcard(nick)) {
        return nullptr;
    }

    preferences::acquaintance new_entry(nick, "friend", note);

    acquaintances_map::iterator iter;
    bool success;

    std::tie(iter, success) = map.emplace(nick, new_entry)

    if(success) {
        save_acquaintances();

        return &iter->second;
    }

    return nullptr;
}