From bc6fd803e5e6c71969575272a7c6ba235dc26967 Mon Sep 17 00:00:00 2001
From: wangyusong <admin@wangyusong.com>
Date: Tue, 27 Sep 2022 14:49:58 +0800
Subject: [PATCH] add week1

---
 README.md     |  3 +++
 week1/nft.sol | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 week1/nft.sol

diff --git a/README.md b/README.md
index aad942b..48f1317 100644
--- a/README.md
+++ b/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)
diff --git a/week1/nft.sol b/week1/nft.sol
new file mode 100644
index 0000000..334f476
--- /dev/null
+++ b/week1/nft.sol
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.4;
+
+import "@openzeppelin/contracts@4.7.3/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts@4.7.3/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/contracts@4.7.3/token/ERC721/extensions/ERC721URIStorage.sol";
+import "@openzeppelin/contracts@4.7.3/token/ERC721/extensions/ERC721Burnable.sol";
+import "@openzeppelin/contracts@4.7.3/access/Ownable.sol";
+import "@openzeppelin/contracts@4.7.3/utils/Counters.sol";
+
+/// @custom:security-contact wangyusong.com@gmail.com
+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);
+    }
+}