First issue

.gitattributes

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+*.sol linguist-language=Solidity

.gitignore

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+# Buidler files
+cache
+artifacts
+node_modules
+
+# VSCode
+ethereum-multi-send.code-workspace

buidler.config.js

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+usePlugin("@nomiclabs/buidler-truffle5");
+
+// This is a sample Buidler task. To learn how to create your own go to
+// https://buidler.dev/guides/create-task.html
+task("accounts", "Prints the list of accounts", async () => {
+  const accounts = await web3.eth.getAccounts();
+
+  for (const account of accounts) {
+    console.log(account);
+  }
+});
+
+module.exports = {
+  defaultNetwork: "buidlerevm",
+  solc: {
+    version: "0.5.16",
+    optimizer: {
+      enabled: true,
+      runs: 200
+    }
+  }
+};

contracts/MultiTransferEther.sol

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+pragma solidity ^0.5.15;
+
+contract MultiTransferEther {
+    constructor(address payable account, address payable[] memory recipients, uint256[] memory amounts) public payable {
+        require(account != address(0), "MultiTransfer: account is the zero address");
+        require(recipients.length > 0, "MultiTransfer: recipients length is zero");
+        require(recipients.length == amounts.length, "MultiTransfer: size of recipients and amounts is not the same");
+
+        for (uint256 i = 0; i < recipients.length; i++) {
+            recipients[i].transfer(amounts[i]);
+        }
+        selfdestruct(account);
+    }
+}