Update 34.ERC721 readme.md

add link for "ERC721.sol"
AmazingAng · Oct 14, 2024 · 2af028e · 2af028e
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diff --git a/34_ERC721/readme.md b/34_ERC721/readme.md
@@ -590,7 +590,7 @@ interface ERC721Metadata /* is ERC721 */ {
 IERC721Metadata.name.selector ^ IERC721Metadata.symbol.selector ^ IERC721Metadata.tokenURI.selector
 ```
 
-solmate实现的ERC721.sol （https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol） 是怎么完成这些ERC165要求的特性的呢？
+solmate实现的[ERC721.sol](https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC721.sol)是怎么完成这些ERC165要求的特性的呢？
 
 ```solidity
 function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {