Remix Ethereum

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https://remix.ethereum.org/

Remix - Ethereum IDE

pragma solidity >=0.4.0 <0.5.0;

contract first_contract {

    uint public balance;

    address[] private givers;

    address private taker;

    address public owner;

    modifier onlyOwner() { require (msg.sender == owner); _;}

    constructor() public payable {

        owner = msg.sender;

    }

    function setTaker(address _addr) onlyOwner public {

        taker = _addr;

    }

    function deposit() public payable {

        balance += msg.value;

        givers.push(msg.sender);

    }

    function sendMoney() onlyOwner public payable {

        require (givers.length >= 2);

        taker.transfer(balance);

    }

}