public void Write(string filePath, IEnumerable<Sale> sales)
        {
            using (var csvWriter = new CSVFileWriter(filePath))
            {
                foreach(var sale in sales)
                {
                    var saleDate = sale.SaleDate;
                    var clientName = sale.Client.Name;
                    var productName = sale.Product.ProductName;
                    var cost = sale.Product.Cost;

                    var values = new object[] { saleDate, clientName, productName, cost };
                    csvWriter.WriteLine(values);
                }
            }
        }