fix: remove not needed buyer parameter

contracts/facets/GBMFacet.sol

@@ -149,22 +149,21 @@ contract GBMFacet is IGBM, IERC1155TokenReceiver, IERC721TokenReceiver, Modifier
     /// @param _auctionID The auctionId of the auction to complete
     //No change necessary for this function code, but it use overriden internal and hence need overriding too in the diamond
     function buyNow(uint256 _auctionID) public {
-        _buyNowImplementation(_auctionID, msg.sender, msg.sender);
+        _buyNowImplementation(_auctionID,  msg.sender);
     }
 
     /// @notice Attribute a token to a specified recipient and distribute the proceeds to the owner of this contract.
     /// @param _auctionID The auctionId of the auction to complete
     /// @param _recipient The address of the recipient who will receive the NFT
     function buyNowFor(uint256 _auctionID, address _recipient) public {
         require(_recipient != address(0), "Invalid recipient address");
-        _buyNowImplementation(_auctionID, msg.sender, _recipient);
+        _buyNowImplementation(_auctionID, _recipient);
     }
 
     /// @dev Internal function to handle the logic of buying an auction item.
     /// @param _auctionID The ID of the auction.
-    /// @param _buyer The address of the buyer.
     /// @param _recipient The address of the recipient of the NFT.
-    function _buyNowImplementation(uint256 _auctionID, address _buyer, address _recipient) internal {
+    function _buyNowImplementation(uint256 _auctionID, address _recipient) internal {
         _validateAuctionExistence(_auctionID);
 
         Auction storage a = s.auctions[_auctionID];
@@ -180,7 +179,7 @@ contract GBMFacet is IGBM, IERC1155TokenReceiver, IERC721TokenReceiver, Modifier
         a.claimed = true;
 
         // Transfer the money of the buyer to the GBM Diamond
-        IERC20(s.GHST).transferFrom(_buyer, address(this), ae1bnp);
+        IERC20(s.GHST).transferFrom(msg.sender, address(this), ae1bnp);
 
         // Refund the highest bidder
         if (a.highestBid > 0) {