fix syntax

contracts/intf/IDODOIncentiveBsc.sol

@@ -1,19 +0,0 @@
-/*
-
-    Copyright 2020 DODO ZOO.
-    SPDX-License-Identifier: Apache-2.0
-
-*/
-
-pragma solidity 0.6.9;
-pragma experimental ABIEncoderV2;
-
-interface IDODOIncentiveBsc {
-    function triggerIncentive(
-        address fromToken,
-        address toToken,
-        uint256 fromAmount,
-        uint256 returnAmount,
-        address assetTo
-    ) external;
-}

contracts/intf/IERC1155.sol

@@ -1,7 +1,7 @@
 // This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/solc-0.6/contracts/token/ERC1155/IERC1155.sol
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.6.2 <0.8.0;
+pragma solidity 0.6.9;
 
 import "./IERC165.sol";
 

contracts/intf/IERC1155Receiver.sol

@@ -1,9 +1,9 @@
 // This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC1155/IERC1155Receiver.sol
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.6.0 <0.8.0;
+pragma solidity 0.6.9;
 
-import "./ERC165.sol";
+import "./IERC165.sol";
 
 /**
  * _Available since v3.1._

contracts/intf/IERC165.sol

@@ -1,7 +1,7 @@
 // This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/solc-0.6/contracts/introspection/IERC165.sol
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.6.0 <0.8.0;
+pragma solidity 0.6.9;
 
 /**
  * @dev Interface of the ERC165 standard, as defined in the

contracts/intf/IERC20.sol

@@ -1,7 +1,8 @@
-// This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/solc-0.6/contracts/token/ERC20/IERC20.sol
+// This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.6.0 <0.8.0;
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
 
 /**
  * @dev Interface of the ERC20 standard as defined in the EIP.
@@ -12,6 +13,12 @@ interface IERC20 {
      */
     function totalSupply() external view returns (uint256);
 
+    function decimals() external view returns (uint8);
+
+    function name() external view returns (string memory);
+
+    function symbol() external view returns (string memory);
+
     /**
      * @dev Returns the amount of tokens owned by `account`.
      */
@@ -65,18 +72,4 @@ interface IERC20 {
         address recipient,
         uint256 amount
     ) external returns (bool);
-
-    /**
-     * @dev Emitted when `value` tokens are moved from one account (`from`) to
-     * another (`to`).
-     *
-     * Note that `value` may be zero.
-     */
-    event Transfer(address indexed from, address indexed to, uint256 value);
-
-    /**
-     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
-     * a call to {approve}. `value` is the new allowance.
-     */
-    event Approval(address indexed owner, address indexed spender, uint256 value);
-}
+}

contracts/intf/IERC721.sol

@@ -1,7 +1,7 @@
 // This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/solc-0.6/contracts/token/ERC721/IERC721.sol
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.6.2 <0.8.0;
+pragma solidity 0.6.9;
 
 import "./IERC165.sol";
 

contracts/intf/IERC721Receiver.sol

@@ -1,7 +1,7 @@
 // This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/solc-0.6/contracts/token/ERC721/IERC721Receiver.sol
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.6.0 <0.8.0;
+pragma solidity 0.6.9;
 
 /**
  * @title ERC721 token receiver interface

contracts/intf/ILockedTokenVault02.sol

@@ -1,13 +0,0 @@
-/*
-
-    Copyright 2020 DODO ZOO.
-    SPDX-License-Identifier: Apache-2.0
-
-*/
-
-pragma solidity 0.6.9;
-pragma experimental ABIEncoderV2;
-
-interface ILockedTokenVault02 {
-    function tradeIncentive(address trader, uint256 amount) external;
-}