Add support for dynamic and nested NFTs

contracts/MyNFT.sol

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
+import "@openzeppelin/contracts/utils/Counters.sol";
+
+contract MyNFT is ERC721 {
+
+    enum NftType { Static, Dynamic, Nested }
+
+    using Counters for Counters.Counter;
+    Counters.Counter private _tokenIds;
+
+    struct NftData {
+        NftType nftType;
+        uint256 parentId;
+        uint256[] childIds;
+    }
+
+    mapping(uint256 => NftData) private nftData;
+
+    constructor(string memory _name, string memory _symbol) ERC721(_name, _symbol) {}
+        function createStaticNft(address _recipient, uint256 _tokenId) external {
+        _safeMint(_recipient, _tokenId);
+        nftData[_tokenId] = NftData(NftType.Static, 0, new uint256[](0));
+    }
+
+    function createDynamicNft(address _recipient) external returns (uint256) {
+        _tokenIds.increment();
+        uint256 tokenId = _tokenIds.current();
+        _safeMint(_recipient, tokenId);
+        nftData[tokenId] = NftData(NftType.Dynamic, 0, new uint256[](0));
+        return tokenId;
+    }
+
+    function createNestedNft(address _recipient, uint256 _parentId) external returns (uint256) {
+        _tokenIds.increment();
+        uint256 tokenId = _tokenIds.current();
+        _safeMint(_recipient, tokenId);
+        nftData[tokenId] = NftData(NftType.Nested, _parentId, new uint256[](0));
+        nftData[_parentId].childIds.push(tokenId);
+        return tokenId;
+    }
+
+    function getChildNfts(uint256 _parentId) external view returns (uint256[] memory) {
+        return nftData[_parentId].childIds;
+    }
+
+}