[chore:] Combining Addresses function (basic, not working)

CombineAddresses.cs

@@ -0,0 +1,87 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Avalonia.Threading;
+
+namespace Logof_Client;
+
+public class CombineAddresses
+{
+    private readonly ProgressWindow _progress;
+
+    public CombineAddresses(ProgressWindow progressWindow)
+    {
+        _progress = progressWindow;
+    }
+
+    public async Task<KasAddressList> Perform(List<KasAddressList> address_lists)
+    {
+        KasAddressList result = new();
+        for (var i = 0; i < address_lists.Count; i++)
+            if (i == 0)
+                result = address_lists[i];
+            else
+                result = await Merge(result, address_lists[i], i + 1, address_lists.Count);
+
+        return result;
+    }
+
+    private async Task<KasAddressList> Merge(KasAddressList first, KasAddressList second, int num, int total)
+    {
+        KasAddressList result = new();
+        foreach (var sec in second.KasPersons)
+        {
+            var is_new = true;
+            foreach (var fi in first.KasPersons)
+            {
+                if (fi.refsid == sec.refsid)
+                {
+                    is_new = false;
+                    break;
+                }
+
+                if (fi.name == sec.name &&
+                    fi.anrede == sec.anrede &&
+                    fi.anredzus == sec.anredzus &&
+                    fi.namezus == sec.namezus &&
+                    fi.titel == sec.titel &&
+                    fi.adel == sec.adel &&
+                    fi.strasse == sec.strasse &&
+                    fi.strasse2 == sec.strasse2 &&
+                    fi.vorname == sec.vorname &&
+                    fi.ort == sec.ort &&
+                    fi.land == sec.land &&
+                    fi.plz == sec.plz &&
+                    fi.pplz == sec.pplz &&
+                    fi.funktion == sec.funktion &&
+                    fi.funktion2 == sec.funktion2 &&
+                    fi.funktionad == sec.funktionad &&
+                    fi.abteilung == sec.abteilung &&
+                    fi.postfach == sec.postfach &&
+                    fi.name1 == sec.name1 &&
+                    fi.name2 == sec.name2 &&
+                    fi.name3 == sec.name3 &&
+                    fi.name4 == sec.name4 &&
+                    fi.name5 == sec.name5)
+                {
+                    is_new = false;
+                    break;
+                }
+            }
+
+            if (is_new) result.KasPersons.Add(sec);
+            var subperc = second.KasPersons.IndexOf(sec) / second.KasPersons.Count;
+            var percent = (num + (double)subperc) / total * 100;
+            await Dispatcher.UIThread.InvokeAsync(() =>
+            {
+                if (is_new)
+                    _progress.AddToLog($"Person mit refsid {sec.refsid} ergänzt");
+                else
+                    _progress.AddToLog($"Person mit refsid {sec.refsid} bereits vorhanden");
+
+                _progress.ChangePercentage(percent);
+            });
+        }
+
+        return result;
+    }
+}