comflux-coin/contracts/internal/BaseInternal.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.1;

import "./SponsorWhitelistControl.sol";

contract BaseInternal{
    SponsorWhitelistControl public constant SPONSOR =
        SponsorWhitelistControl(
            address(0x0888000000000000000000000000000000000001)
        );

    function add_privege(address account) public payable{
        // register all users as sponsees
        address[] memory users = new address[](1);
        users[0] = account;
        SPONSOR.addPrivilege(users);
    }
    
    function remove_privege(address account) public payable{
        // register all users as sponsees
        address[] memory users = new address[](1);
        users[0] = account;
        SPONSOR.addPrivilege(users);
    }
}