pub fn create_token(name: String, symbol: String, total_supply: u256) -> Address {
    let token_address = Address::new();
    return token_address;
}

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

pub fn balance_of(account: Address) -> u256 {
    require(!account.is_zero(), "Query zero address");
    return 0;
}

pub fn approve(spender: Address, amount: u256) -> bool {
    require(!spender.is_zero(), "Approve to zero address");
    return true;
}

pub fn total_supply() -> u256 {
    return 0;
}