Add LogicV2 contract with counter initialization, increment, decrement, and retrieval functions

Author: oumaoumag

src/LogicV2.sol

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+// Upgraded Logic Contract (Version 2)
+contract LogicV2 {
+    uint256 public counter;
+
+    // Initializes the counter, compatible with V1
+    function initialize(uint256 _initialValue) external {
+        require(counter == 0, "Already initialized");
+        counter = _initialValue;
+    }
+
+    // Increments the counter
+    function increment() external {
+        counter += 1;
+    }
+
+    // Decrements the counter (new feature)
+    function decrement() external {
+        require(counter > 0, "Counter underflow");
+        counter -= 1;
+    }
+
+    // Returns the counter value
+    function getCounter() external view returns (uint256) {
+        return counter;
+    }
+}