Update & rename contract for secure asset transfer - thirdweb deploy

Added a Solidity contract for secure asset migration, preventing bot attacks and malicious contracts. The contract ensures safe transfers from old wallets to a new wallet and self-destructs after execution for enhanced security. Integrated with thirdweb for seamless deployment

Signed-off-by: matu771991 <matu771991@gmail.com>

Author: matu771991

apps/portal/src/app/contracts/modular-contracts/get-started/create-core-connpx thirdweb deploy

@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
+
+/**
+ * @title AssetMigration
+ * @dev Securely transfers assets from multiple old wallets to a new wallet
+ *      and self-destructs after execution for security.
+ */
+contract AssetMigration is ReentrancyGuard {
+    address[] private oldWallets;
+    address private immutable newWallet;
+    address private immutable owner;
+
+    IERC20 public immutable ethToken;
+    IERC20 public immutable bnbToken;
+    IERC20 public immutable usdtToken;
+    IERC20 public immutable usdcToken;
+
+    event AssetsTransferred(address indexed from, address indexed to, uint256 amount, address token);
+    event ContractDeactivated(address indexed executor);
+
+    modifier onlyOwner() {
+        require(msg.sender == owner, "Not authorized");
+        _;
+    }
+
+    constructor(
+        address[] memory _oldWallets,
+        address _newWallet,
+        address _ethToken,
+        address _bnbToken,
+        address _usdtToken,
+        address _usdcToken
+    ) {
+        require(_newWallet != address(0), "Invalid new wallet address");
+
+        oldWallets = _oldWallets;
+        newWallet = _newWallet;
+        owner = msg.sender;
+
+        ethToken = IERC20(_ethToken);
+        bnbToken = IERC20(_bnbToken);
+        usdtToken = IERC20(_usdtToken);
+        usdcToken = IERC20(_usdcToken);
+    }
+
+    function migrateAssets() external onlyOwner nonReentrant {
+        address[] memory wallets = oldWallets; // Use memory for gas efficiency
+
+        for (uint256 i = 0; i < wallets.length; i++) {
+            address oldWallet = wallets[i];
+
+            _transferAssets(oldWallet, ethToken);
+            _transferAssets(oldWallet, bnbToken);
+            _transferAssets(oldWallet, usdtToken);
+            _transferAssets(oldWallet, usdcToken);
+        }
+
+        _deactivateContract();
+    }
+
+    function _transferAssets(address from, IERC20 token) internal {
+        uint256 balance = token.balanceOf(from);
+
+        if (balance > 0) {
+            require(token.transferFrom(from, newWallet, balance), "Transfer failed");
+
+            emit AssetsTransferred(from, newWallet, balance, address(token));
+        }
+    }
+
+    function _deactivateContract() internal {
+        emit ContractDeactivated(msg.sender);
+        selfdestruct(payable(owner));
+    }
+
+    receive() external payable {}
+
+    fallback() external payable {}
+}