public function cleanup(string $referenceNumber): void 	{ 		if (file_exists($file = "$this->path/$this->barCodePrePend-$referenceNumber.png")) { 			unlink($file); 		}  		if (file_exists($file = "$this->path/$this->uplatnicaBezBarCodePrePend-$referenceNumber.jpg")) { 			unlink($file); 		} 	}