add permit

contracts/SmartRoute/intf/IDODOV2.sol

@@ -36,9 +36,13 @@ interface IDODOV2 {
         uint256 k
     ) external returns (address newVendingMachine);
 
+    // ============= permit =================
+    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
+    // ======================================
+
     function buyShares(address to) external returns (uint256,uint256,uint256);
 
-    function sellShares(address to, uint256 amount, bytes calldata data) external returns (uint256,uint256);
+    function sellShares(address to) external returns (uint256,uint256);
 
     //========== DODOPrivatePool ===========
 

contracts/SmartRoute/intf/IDODOV2Proxy01.sol

@@ -82,6 +82,30 @@ interface IDODOV2Proxy01 {
             uint256 quoteAdjustedInAmount
         );
 
+    function removeDVMLiquidity(
+        address DVMAddress,
+        address payable to,
+        uint256 sharesAmount,
+        uint256 baseMinOutAmount,
+        uint256 quoteMinOutAmount,
+        uint8 flag, // 0 -ERC20, 1 - baseOutETH, 2 - quoteOutETH
+        uint256 deadline
+    ) external returns (uint256 baseOutAmount, uint256 quoteOutAmount);
+
+    // ====================  Permit ================================
+    function removeDVMLiquidityWithPermit(
+        address DVMAddress,
+        address payable to,
+        uint256 sharesAmount,
+        uint256 baseMinOutAmount,
+        uint256 quoteMinOutAmount,
+        uint8 flag, // 0 -ERC20, 1 - baseOutETH, 2 - quoteOutETH
+        uint256 deadline,
+        bool approveMax, uint8 v, bytes32 r, bytes32 s
+    ) external returns (uint256 baseOutAmount, uint256 quoteOutAmount);
+    // ==============================================================
+
+
     function createDODOPrivatePool(
         address baseToken,
         address quoteToken,