From 46e7e227229d79bdee23a2b3ca371b9efd24706d Mon Sep 17 00:00:00 2001
From: MarcUs7i <96580944+MarcUs7i@users.noreply.github.com>
Date: Fri, 21 Mar 2025 09:36:40 +0100
Subject: [PATCH] completed everything

---
 Supermarket/Product.cs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/Supermarket/Product.cs b/Supermarket/Product.cs
index 862cc4c..f2b2198 100644
--- a/Supermarket/Product.cs
+++ b/Supermarket/Product.cs
@@ -75,7 +75,7 @@ public abstract class Product
     /// <returns>True if the bar code is valid, false otherwise</returns>
     public static bool IsBarcodeValid(string? barcode)
     {
-        if (barcode == null)
+        if (string.IsNullOrEmpty(barcode) || barcode.Length != 8)
         {
             return false;
         }
@@ -101,14 +101,14 @@ public abstract class Product
             {
                 break;
             }
-
-            int digit = int.Parse(barcode[i].ToString());
+    
+            int digit = barcode[i] - '0';
             weight += i % 2 == 0 ? digit * evenWeight : digit * oddWeight;
         }
         
-        int calculatedCheckDigit = 10 - (weight % 10) % 10;
+        int calculatedCheckDigit = (10 - (weight % 10)) % 10;
         
-        return calculatedCheckDigit == int.Parse(barcode[^1].ToString());
+        return calculatedCheckDigit == barcode[^1] - '0';
     }
     
     /// <summary>