add week1

README.md

@@ -1,2 +1,5 @@
 # roadtoweb3
 The alchemy Challenges
+
+# This is the repo for Road to web3 Chanllenges by Alchemy
+See [welcome-to-the-road-to-web3](https://docs.alchemy.com/docs/welcome-to-the-road-to-web3)

week1/nft.sol

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.4;
+
+import "@openzeppelin/[email protected]/token/ERC721/ERC721.sol";
+import "@openzeppelin/[email protected]/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/[email protected]/token/ERC721/extensions/ERC721URIStorage.sol";
+import "@openzeppelin/[email protected]/token/ERC721/extensions/ERC721Burnable.sol";
+import "@openzeppelin/[email protected]/access/Ownable.sol";
+import "@openzeppelin/[email protected]/utils/Counters.sol";
+
+/// @custom:security-contact [email protected]
+contract Week1 is ERC721, ERC721Enumerable, ERC721URIStorage, ERC721Burnable, Ownable {
+    using Counters for Counters.Counter;
+
+    Counters.Counter private _tokenIdCounter;
+
+    constructor() ERC721("Alchemy", "ALCH") {}
+
+    function safeMint(address to, string memory uri) public onlyOwner {
+        uint256 tokenId = _tokenIdCounter.current();
+        _tokenIdCounter.increment();
+        _safeMint(to, tokenId);
+        _setTokenURI(tokenId, uri);
+    }
+
+    // The following functions are overrides required by Solidity.
+
+    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
+        internal
+        override(ERC721, ERC721Enumerable)
+    {
+        super._beforeTokenTransfer(from, to, tokenId);
+    }
+
+    function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
+        super._burn(tokenId);
+    }
+
+    function tokenURI(uint256 tokenId)
+        public
+        view
+        override(ERC721, ERC721URIStorage)
+        returns (string memory)
+    {
+        return super.tokenURI(tokenId);
+    }
+
+    function supportsInterface(bytes4 interfaceId)
+        public
+        view
+        override(ERC721, ERC721Enumerable)
+        returns (bool)
+    {
+        return super.supportsInterface(interfaceId);
+    }
+}