Put EVM writer interface into a file

Author: Mike-CZ

contracts/interfaces/IEVMWriter.sol

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.9;
+
+interface IEvmWriter {
+    function setBalance(address acc, uint256 value) external;
+
+    function copyCode(address acc, address from) external;
+
+    function swapCode(address acc, address where) external;
+
+    function setStorage(address acc, bytes32 key, bytes32 value) external;
+
+    function incNonce(address acc, uint256 diff) external;
+}

contracts/sfc/NodeDriver.sol

@@ -3,22 +3,11 @@ pragma solidity ^0.8.9;
 
 import {Initializable} from "../common/Initializable.sol";
 import {NodeDriverAuth} from "./NodeDriverAuth.sol";
-
-interface EVMWriter {
-    function setBalance(address acc, uint256 value) external;
-
-    function copyCode(address acc, address from) external;
-
-    function swapCode(address acc, address where) external;
-
-    function setStorage(address acc, bytes32 key, bytes32 value) external;
-
-    function incNonce(address acc, uint256 diff) external;
-}
+import {IEvmWriter} from "../interfaces/IEVMWriter.sol";
 
 contract NodeDriver is Initializable {
     NodeDriverAuth internal backend;
-    EVMWriter internal evmWriter;
+    IEvmWriter internal evmWriter;
 
     event UpdatedBackend(address indexed backend);
 
@@ -42,7 +31,7 @@ contract NodeDriver is Initializable {
     function initialize(address _backend, address _evmWriterAddress) external initializer {
         backend = NodeDriverAuth(_backend);
         emit UpdatedBackend(_backend);
-        evmWriter = EVMWriter(_evmWriterAddress);
+        evmWriter = IEvmWriter(_evmWriterAddress);
     }
 
     function setBalance(address acc, uint256 value) external onlyBackend {

contracts/test/StubEvmWriter.sol

@@ -1,9 +1,9 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.9;
 
-import {EVMWriter} from "../sfc/NodeDriver.sol";
+import {IEvmWriter} from "../interfaces/IEVMWriter.sol";
 
-contract StubEvmWriter is EVMWriter {
+contract StubEvmWriter is IEvmWriter {
     function setBalance(address acc, uint256 value) external {}
 
     function copyCode(address acc, address from) external {}