remove constructor because using proxy mode clone

contracts/dodo.sol

@@ -33,10 +33,14 @@ contract DODO is Admin, Trader, LiquidityProvider {
         uint256 mtFeeRate,
         uint256 k,
         uint256 gasPriceLimit
-    ) external onlyOwner preventReentrant {
+    ) external {
         require(!_INITIALIZED_, "DODO_INITIALIZED");
         _INITIALIZED_ = true;
 
+        // constructor
+        _OWNER_ = msg.sender;
+        emit OwnershipTransferred(address(0), _OWNER_);
+
         _SUPERVISOR_ = supervisor;
         _MAINTAINER_ = maintainer;
         _BASE_TOKEN_ = baseToken;

contracts/impl/Storage.sol

@@ -8,7 +8,7 @@
 pragma solidity 0.6.9;
 pragma experimental ABIEncoderV2;
 
-import {Ownable} from "../lib/Ownable.sol";
+import {InitializableOwnable} from "../lib/InitializableOwnable.sol";
 import {SafeMath} from "../lib/SafeMath.sol";
 import {DecimalMath} from "../lib/DecimalMath.sol";
 import {ReentrancyGuard} from "../lib/ReentrancyGuard.sol";
@@ -22,7 +22,7 @@ import {Types} from "../lib/Types.sol";
  *
  * @notice Local Variables
  */
-contract Storage is Ownable, ReentrancyGuard {
+contract Storage is InitializableOwnable, ReentrancyGuard {
     using SafeMath for uint256;
 
     // ============ Variables for Control ============

contracts/lib/InitializableOwnable.sol

@@ -0,0 +1,48 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Ownable
+ * @author DODO Breeder
+ *
+ * @notice Ownership related functions
+ */
+contract InitializableOwnable {
+    address public _OWNER_;
+    address public _NEW_OWNER_;
+
+    // ============ Events ============
+
+    event OwnershipTransferPrepared(address indexed previousOwner, address indexed newOwner);
+
+    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
+
+    // ============ Modifiers ============
+
+    modifier onlyOwner() {
+        require(msg.sender == _OWNER_, "NOT_OWNER");
+        _;
+    }
+
+    // ============ Functions ============
+
+    function transferOwnership(address newOwner) external onlyOwner {
+        require(newOwner != address(0), "INVALID_OWNER");
+        emit OwnershipTransferPrepared(_OWNER_, newOwner);
+        _NEW_OWNER_ = newOwner;
+    }
+
+    function claimOwnership() external {
+        require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM");
+        emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
+        _OWNER_ = _NEW_OWNER_;
+        _NEW_OWNER_ = address(0);
+    }
+}