From 6cb9c6d22625086ddc39a04bd350d3eefaa56d9f Mon Sep 17 00:00:00 2001
From: Samyak Jain <34437877+KaymasJain@users.noreply.github.com>
Date: Fri, 19 Nov 2021 20:10:44 +0530
Subject: [PATCH] fixed bugs

---
 .../connectors/uniswap-sell-beta/helpers.sol     | 16 +++++++++++-----
 .../connectors/uniswap-sell-beta/main.sol        |  2 +-
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/contracts/arbitrum/connectors/uniswap-sell-beta/helpers.sol b/contracts/arbitrum/connectors/uniswap-sell-beta/helpers.sol
index 395837fc..cd614a5e 100644
--- a/contracts/arbitrum/connectors/uniswap-sell-beta/helpers.sol
+++ b/contracts/arbitrum/connectors/uniswap-sell-beta/helpers.sol
@@ -1,11 +1,17 @@
 pragma solidity ^0.7.6;
 pragma abicoder v2;
 
-import "./interface.sol";
+import {
+    UniswapV3Pool,
+    ISwapRouter
+} from "./interface.sol";
 import {SqrtPriceMath} from "./libraries/SqrtPriceMath.sol";
-import "./libraries/TransferHelper.sol";
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
+
+contract Helpers {
+    using SafeERC20 for IERC20;
 
-contract Helpers is ISwapRouter {
     ISwapRouter constant public router =
         ISwapRouter(0xE592427A0AEce92De3Edee1F18E0157C05861564);
 
@@ -53,9 +59,9 @@ contract Helpers is ISwapRouter {
         address recipient,
         uint256 amountIn
     ) public {
-        TransferHelper.safeTransferFrom(tokenIn, sender, recipient, amountIn);
+        IERC20(tokenIn).safeTransferFrom(sender, recipient, amountIn);
 
-        TransferHelper.safeApprove(tokenIn, address(router), amountIn);
+        IERC20(tokenIn).safeApprove(address(router), amountIn);
     }
 
     function swapSingleInput(ISwapRouter.ExactInputSingleParams memory params)
diff --git a/contracts/arbitrum/connectors/uniswap-sell-beta/main.sol b/contracts/arbitrum/connectors/uniswap-sell-beta/main.sol
index 87274cfd..92926f0f 100644
--- a/contracts/arbitrum/connectors/uniswap-sell-beta/main.sol
+++ b/contracts/arbitrum/connectors/uniswap-sell-beta/main.sol
@@ -3,7 +3,7 @@ pragma abicoder v2;
 
 import "./helpers.sol";
 
-abstract contract uniswapSellBeta is Helpers {
+contract uniswapSellBeta is Helpers {
     function sell(
         address tokenIn,
         address tokenOut,