refactor mixSwap && add trade adapter

contracts/lib/FeeRateModelLogicUpdate.sol

@@ -17,9 +17,6 @@ contract FeeRateModelLogicUpdate is ReentrancyGuard ,InitializableOwnable{
     uint256 public _FEE_RATE_;
     mapping(address => uint256) feeMapping;
 
-
-    event Log(string str, bool result);
-
     function setSpecificFeeRate(address trader, uint256 feeRate) external onlyOwner {
         require(trader != address(0), "INVALID ADDRESS!");
         feeMapping[trader] = 0;