From d8efab77aa9a6e0b3d09172cc89983575b9b5c99 Mon Sep 17 00:00:00 2001
From: leovct <l009.vincent@gmail.com>
Date: Wed, 25 Sep 2024 12:34:05 +0200
Subject: [PATCH] feat: add ethernaut lvl 19

---
 src/EthernautCTF/AlienCode.sol | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/EthernautCTF/AlienCode.sol

diff --git a/src/EthernautCTF/AlienCode.sol b/src/EthernautCTF/AlienCode.sol
new file mode 100644
index 0000000..71a9e95
--- /dev/null
+++ b/src/EthernautCTF/AlienCode.sol
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.5.0;
+
+import '@openzeppelin-05/ownership/Ownable.sol';
+
+contract AlienCodex is Ownable {
+  bool public contact;
+  bytes32[] public codex;
+
+  modifier contacted() {
+    assert(contact);
+    _;
+  }
+
+  function makeContact() public {
+    contact = true;
+  }
+
+  function record(bytes32 _content) public contacted {
+    codex.push(_content);
+  }
+
+  function retract() public contacted {
+    codex.length--;
+  }
+
+  function revise(uint256 i, bytes32 _content) public contacted {
+    codex[i] = _content;
+  }
+}