pub fn mint(to: Address, amount: u256) -> bool {
    require(!to.is_zero(), "Mint to zero address");
    require(amount > 0, "Amount must be positive");
    return true;
}

pub fn burn(from: Address, amount: u256) -> bool {
    require(!from.is_zero(), "Burn from zero address");
    require(amount > 0, "Amount must be positive");
    return true;
}

pub fn pause() -> bool {
    return true;
}

pub fn unpause() -> bool {
    return true;
}