Update sample dapp code

assets/bep-153/SampleStakingContract.sol

@@ -178,6 +178,8 @@ library SafeMath {
 contract StakingDappExample {
   using SafeMath for uint256;
 
+  bool internal locked;
+
   // constants
   uint256 public constant TEN_DECIMALS = 10;
   address public constant STAKING_CONTRACT_ADDR = 0x0000000000000000000000000000000000002001;
@@ -251,8 +253,9 @@ contract StakingDappExample {
     // update reward first
     UserInfo storage user = userInfo[msg.sender];
     _updatePool();
+    uint256 pendingReward;
     if (user.amount > 0) {
-      uint256 pendingReward = user.amount.mul(poolInfo.rewardPerShare).sub(user.rewardDebt);
+      pendingReward = user.amount.mul(poolInfo.rewardPerShare).sub(user.rewardDebt);
     }
     user.amount = user.amount.add(amount);
     user.rewardDebt = user.amount.mul(poolInfo.rewardPerShare).sub(pendingReward);
@@ -295,7 +298,7 @@ contract StakingDappExample {
     }
 
     totalReceived = totalReceived.sub(amount);
-    emit undelegatedSubmitted(msg.sender, amount);
+    emit undelegateSubmitted(msg.sender, amount);
   }
 
   function claimReward() external noReentrant {
@@ -332,22 +335,22 @@ contract StakingDappExample {
   }
 
   /************************** Internal **************************/
-  function _getHighestYieldingValidator() internal returns(address highestYieldingValidator) {
+  function _getHighestYieldingValidator() internal pure returns(address highestYieldingValidator) {
     // this function should return the desirable validator to delegate to
     // need to be implemented by the developer
-    highestYieldingValidator = address("0x1");
+    highestYieldingValidator = address(0x1);
   }
 
-  function _getLowestYieldingValidator() internal returns(address lowestYieldingValidator) {
+  function _getLowestYieldingValidator() internal pure returns(address lowestYieldingValidator) {
     // this function should return the desirable validator to undelegate from
     // need to be implemented by the developer
-    lowestYieldingValidator = address("0x2");
+    lowestYieldingValidator = address(0x2);
   }
 
   function _delegate(uint256 amount, uint256 oracleRelayerFee) internal {
     address validator = _getHighestYieldingValidator();
     IStaking(STAKING_CONTRACT_ADDR).delegate{value: amount.add(oracleRelayerFee)}(validator, amount);
-    emit delegateSubmitted(validator, amount);
+    emit delegateSubmitted(msg.sender, validator, amount);
   }
 
   function _undelegate(uint256 amount, uint256 oracleRelayerFee) internal {
@@ -357,14 +360,14 @@ contract StakingDappExample {
   }
 
   function _claimReward() internal {
-    uint256 amount = IStaking(STAKING_CONTRACT_ADDR).claimReward(address(this));
+    uint256 amount = IStaking(STAKING_CONTRACT_ADDR).claimReward();
     totalReward = totalReward.add(amount);
     reserveReward = reserveReward.add(amount);
     emit rewardReceived(amount);
   }
 
   function _claimUndelegated() internal {
-    uint256 amount = IStaking(STAKING_CONTRACT_ADDR).claimUndeldegated(address(this));
+    uint256 amount = IStaking(STAKING_CONTRACT_ADDR).claimUndeldegated();
     emit undelegatedReceived(amount);
   }
 
@@ -408,7 +411,7 @@ contract StakingDappExample {
 
   /*********************** Params update **************************/
   function transferOwnership(address newOwner) external onlyOwner {
-    own = newOwner;
+    owner = newOwner;
   }
 
   function addOperator(address opt) external onlyOwner {
@@ -418,8 +421,4 @@ contract StakingDappExample {
   function delOperator(address opt) external onlyOwner {
     operators[opt] = false;
   }
-
-  function setReserve(uint256 newReserve) external onlyOperator {
-    reserve = newReserve;
-  }
 }