added tests

.gitmodules

@@ -1,9 +1,3 @@
 [submodule "lib/forge-std"]
 	path = lib/forge-std
 	url = https://github.com/foundry-rs/forge-std
-[submodule "lib/openzeppelin-foundry-upgrades"]
-	path = lib/openzeppelin-foundry-upgrades
-	url = https://github.com/OpenZeppelin/openzeppelin-foundry-upgrades
-[submodule "lib/openzeppelin-contracts-upgradeable"]
-	path = lib/openzeppelin-contracts-upgradeable
-	url = https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable

src/Standalone/StandaloneMultiRewarder.sol

@@ -3,7 +3,6 @@ pragma solidity 0.7.6;
 
 import { SafeMath} from "../dependencies/openzeppelin/contracts/SafeMath.sol";
 import { IERC20 } from "../dependencies/openzeppelin/contracts/IERC20.sol";
-import { SafeERC20 } from "../dependencies/openzeppelin/contracts/SafeERC20.sol";
 
 contract StandaloneMultiRewarder {
 
@@ -88,7 +87,7 @@ contract StandaloneMultiRewarder {
                 _simulateRewardPerToken(_aToken, rewardToken, multiTotalStaked[_aToken].sub(_amount));
         }
 
-        SafeERC20.safeTransferFrom(IERC20(_aToken), msg.sender, address(this), _amount);
+       IERC20(_aToken).transferFrom(msg.sender, address(this), _amount);
 
         emit multiStakeRecorded(msg.sender, _aToken, _amount);
     }
@@ -98,13 +97,13 @@ contract StandaloneMultiRewarder {
         require(_amount > 0, "amount must be greater than 0");
         require(_amount <= multiUserStaked[msg.sender][_aToken], "insufficient staked amount");
 
-        _claimMultiRewards(_aToken, msg.sender);
+        claimMultiRewards(_aToken);
         uint256 stakedAmount = multiUserStaked[msg.sender][_aToken];
         require(stakedAmount >= _amount, "insufficient staked amount");
         multiUserStaked[msg.sender][_aToken] = stakedAmount.sub(_amount);
         multiTotalStaked[_aToken] = multiTotalStaked[_aToken].sub(_amount);
 
-        SafeERC20.safeTransfer(IERC20(_aToken), msg.sender, _amount);
+        IERC20(_aToken).transfer(msg.sender, _amount);
 
         emit multiUnstakeRecorded(msg.sender, _aToken, _amount);
     }
@@ -128,7 +127,7 @@ contract StandaloneMultiRewarder {
             multiUserRewardOffset[msg.sender][_aToken][
                 rewardToken
             ] = multiRewardPerToken[_aToken][rewardToken];
-            SafeERC20.safeTransfer(IERC20(rewardToken), msg.sender, earnedAmountActual);
+            IERC20(rewardToken).transfer(msg.sender, earnedAmountActual);
 
             emit multiRewardHarvested(msg.sender, _aToken, rewardToken, earnedAmountActual);
         }