[chore:] initial address repair (fixes german plzs if too short)

Tasks/AddressRepair.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 
 namespace Logof_Client;
 
@@ -7,20 +8,28 @@ public class AddressRepair(ProgressWindow progressWindow)
 {
     private readonly ProgressWindow _progress = progressWindow;
 
-    public KasAddressList Perform(KasAddressList all_addresses,
-        List<(int, List<AddressCheck.ErrorTypes>)> failed_addresses)
+    public async Task Perform(KasAddressList list)
     {
         try
+        {
+            foreach (var person in list.KasPersons)
             {
                 
+                // German PLZ too short (e.g. Dresden)
+                if (person.IsGermany() && person.plz.Length <= 4)
+                {
+                    while (person.plz.Length <= 4)
+                    {
+                        person.plz = "0" + person.plz;
+                    }
+                }
+                
+            }
         }
         catch (Exception ex)
         {
-            Logger.Log($"Error while performing address repair: {ex.Message}", Logger.LogType.Error);
+            Logger.Log($"Error while performing address shortener: {ex.Message}", Logger.LogType.Error);
         }
         
-        return null;
-
-        return null;
     }
 }