feat: add tests for withdraw, fee and make it DRY

foundry/script/Deploy.sol

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import {Script, console} from "forge-std/Script.sol";
+
+contract DeployScript is Script {
+// TODO: implement deploy script
+}