Multisend.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

contract Multisend {

    address owner;

    constructor() {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "only owner required");
        _;
    }

    function sendToMany(address[] memory receivers, uint _amount) external onlyOwner {
        require(receivers.length > 0, "can't send money to no one");
        uint totalAmount = _amount * receivers.length;

        require(address(this).balance > totalAmount, "insufficient fund for disbursement");
        
        for(uint i = 0; i < receivers.length; i++) {
            payable(receivers[i]).transfer(_amount);
        }
    }

    function deposit() external payable {
        require(msg.value > 0, "can't send zero value");
    }

    function getContractBalance() external view returns (uint bal) {
        bal = address(this).balance;
    }

    function withdraw(uint _amount) external onlyOwner {
        require(address(this).balance > _amount, "insufficient fund");
        payable(msg.sender).transfer(_amount);
    }

    receive() external payable {}
    fallback() external payable {}
}