pub fn add_rule(rule_id: u256, description: String) -> bool {
    require(rule_id > 0, "Invalid rule ID");
    require(description.len() > 0, "Description cannot be empty");
    return true;
}

pub fn check_rule(rule_id: u256, account: Address) -> bool {
    require(rule_id > 0, "Invalid rule ID");
    require(!account.is_zero(), "Invalid account");
    return true;
}

pub fn remove_rule(rule_id: u256) -> bool {
    require(rule_id > 0, "Invalid rule ID");
    return true;
}