add helper functions

contracts/DODOToken/vDODOToken.sol

@@ -1,8 +1,6 @@
 /*
-
     Copyright 2020 DODO ZOO.
     SPDX-License-Identifier: Apache-2.0
-
 */
 pragma solidity 0.6.9;
 pragma experimental ABIEncoderV2;
@@ -57,7 +55,6 @@ contract vDODOToken is InitializableOwnable {
     uint32 public _LAST_REWARD_BLOCK_;
 
     uint256 public _TOTAL_BLOCK_REWARD_;
-
     uint256 public _TOTAL_STAKING_POWER_;
     mapping(address => UserInfo) public userInfo;
 
@@ -356,6 +353,7 @@ contract vDODOToken is InitializableOwnable {
 
         to.stakingPower = uint128(uint256(to.stakingPower).add(stakingPower));
         to.superiorSP = uint128(uint256(to.superiorSP).add(superiorIncreSP));
+
         superior.stakingPower = uint128(uint256(superior.stakingPower).add(superiorIncreSP));
         superior.credit = uint128(uint256(superior.credit).add(superiorIncreCredit));
 
@@ -405,4 +403,4 @@ contract vDODOToken is InitializableOwnable {
 
         emit Transfer(from, to, vDODOAmount);
     }
-}
+}