XRUN - Audit

The codebase contains multiple Solidity versions, which can lead to unexpected behavior, potential vulnerabilities, difficulties in maintaining the code, and inconsistencies in the execution of the smart contract. Using different versions may also result in increased complexity during code auditing, as different security features and bug fixes are present in different versions of the compiler. Versions used: `^0.8.20`, `^0.8.0` `^0.8.20` is used in dependency contracts such as ERC20.sol, Context.sol. ```solidity=312 pragma solidity ^0.8.20; ``` `^0.8.0` is used in XRUN.sol file. ```solidity=625 pragma solidity ^0.8.0; ```

The smart contract contains one or more interface definitions that are not used, which can lead to unnecessary complexity and reduced maintainability. ```solidity=257 interface IERC1155Errors { ``` - `IERC1155Errors` is declared but never used. ```solidity=199 interface IERC721Errors { ``` - `IERC721Errors` is declared but never used.