string memory root = vm.projectRoot();
string memory path = string.concat(root, "/src/test/fixtures/broadcast.log.json");
string memory json = vm.readFile(path);
bytes memory transactionDetails = json.parseRaw(".transactions[0].tx");
RawTx1559Detail memory rawTxDetail = abi.decode(transactionDetails, (RawTx1559Detail));

error[9574]: TypeError: Type bytes memory is not implicitly convertible to expected type string memory.
error[8015]: TypeError: Invalid type for argument in the bytes.concat function call. bytes or fixed bytes type is required, but string provided.