如何开发一个批量转账的合约？币安链和以太坊空投工具开发代码与教程

// 数组求和函数
function getSum(uint256[] calldata _arr) public pure returns(uint sum)
{
    for(uint i = 0; i < _arr.length; i++)
        sum = sum + _arr[i];
}

/// @notice 向多个地址转账ERC20代币，使用前需要先授权
///
/// @param _token 转账的ERC20代币地址
/// @param _addresses 空投地址数组
/// @param _amounts 代币数量数组（每个地址的空投数量）
function multiTransferToken(
    address _token,
    address[] calldata _addresses,
    uint256[] calldata _amounts
    ) external {
    // 检查：_addresses和_amounts数组的长度相等
    require(_addresses.length == _amounts.length, "Lengths of Addresses and Amounts NOT EQUAL");
    IERC20 token = IERC20(_token); // 声明IERC合约变量
    uint _amountSum = getSum(_amounts); // 计算空投代币总量
    // 检查：授权代币数量 >= 空投代币总量
    require(token.allowance(msg.sender, address(this)) >= _amountSum, "Need Approve ERC20 token");
    
    // for循环，利用transferFrom函数发送空投
    for (uint8 i; i < _addresses.length; i++) {
        token.transferFrom(msg.sender, _addresses[i], _amounts[i]);
    }
}

/// 向多个地址转账ETH
function multiTransferETH(
    address payable[] calldata _addresses,
    uint256[] calldata _amounts
) public payable {
    // 检查：_addresses和_amounts数组的长度相等
    require(_addresses.length == _amounts.length, "Lengths of Addresses and Amounts NOT EQUAL");
    uint _amountSum = getSum(_amounts); // 计算空投ETH总量
    // 检查转入ETH等于空投总量
    require(msg.value == _amountSum, "Transfer amount error");
    // for循环，利用transfer函数发送ETH
    for (uint256 i = 0; i < _addresses.length; i++) {
        _addresses[i].transfer(_amounts[i]);
    }
}

// _addresses填写
["0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2", "0x5B38Da6a701c568545dCfcB03FcB875f56beddC4"]

// _amounts填写
[100, 200]