address public collector;

constructor(address _collector) Ownable(msg.sender);

function setCollector(address _collector) external onlyOwner;

function airdropERC20(
    address _token,
    address[] calldata _addresses,
    uint256[] calldata _amounts,
    uint256 _totalAmount
)
    external
    payable;

function airdropETH(address[] calldata _addresses, uint256[] calldata _amounts) external payable;

function collectFees() public;

receive() external payable;