Create PIBankNFTRegistry.sol

blockchain_integration/pi_network/contracts/PI-bank/nfts/PIBankNFTRegistry.sol

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+pragma solidity ^0.8.0;
+
+import "./IPIBankNFTRegistry.sol";
+
+contract PIBankNFTRegistry is IPIBankNFTRegistry {
+    mapping(uint256 => NFT) public nfts;
+    uint256 public nftCount;
+
+    struct NFT {
+        string uri;
+        address owner;
+    }
+
+    function mint(address _owner, string calldata _uri) public {
+        NFT memory nft = NFT(_uri, _owner);
+        nfts[nftCount] = nft;
+        nftCount++;
+    }
+
+    function burn(uint256 _nftId) public {
+        NFT storage nft = nfts[_nftId];
+        require(nft.owner == msg.sender, "Only the owner can burn");
+        delete nfts[_nftId];
+    }
+
+    function transfer(address _from, address _to, uint256 _nftId) public {
+        NFT storage nft = nfts[_nftId];
+        require(nft.owner == _from, "Invalid owner");
+        nft.owner = _to;
+    }
+
+    function ownerOf(uint256 _nftId) public view returns (address) {
+        NFT storage nft = nfts[_nftId];
+        return nft.owner;
+    }
+
+    function getNFT(uint256 _nftId) public view returns (string memory) {
+        NFT storage nft = nfts[_nftId];
+        return nft.uri;
+    }
+}