add Programmyday form github

IBANNummerPrüfen/IBANNummerPrüfen.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

IBANNummerPrüfen/IbanPrüfung.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace IBANNummerPrüfen
+{
+    public class IbanPrüfung
+    {
+        // Richtiges IBAN Format: DE68 2105 0170 0012 3456 78
+        //private string? IBAN;
+        private string? ibanCleared;
+        private string? ibanSwapped;
+        private string? sum;
+        private string? iban;
+        public void SetIbanPrüfungEntgegennehmen()
+        {
+            Console.Write("Bitte geben Sie ihre IBAN-Nummer ein: ");
+            this.iban = Console.ReadLine();
+            
+            Console.WriteLine(IBANPrüfung());
+        }
+
+        /// <summary>
+        /// Bestimmt ob die Checksumme einer IBAN gültig ist
+        /// </summary>
+        /// <param name="iban">Der zu prüfende IBAN (z.B: "DE68 2105 0170 0012 3456 78")</param>
+        /// <returns><c>True</c>, wenn <paramref name="value"/> gültig ist. Andernfalls <c>False</c>.</returns>
+        public bool IBANPrüfung()
+        {
+            if (this.iban != null)
+            {
+                this.ibanCleared = this.iban.ToUpper().Replace(" ", "").Replace("-", "").Replace(".", "");
+                //Console.WriteLine(ibanCleared);
+                this.ibanSwapped = ibanCleared.Substring(4) + ibanCleared.Substring(0, 4);
+                //Console.WriteLine(ibanSwapped);
+                this.sum = ibanSwapped.Aggregate("", (current, c) => current + (char.IsLetter(c) ? (c - 55).ToString() : c.ToString()));
+                //Console.WriteLine(sum);
+                //this.sum = ibanCleared.Aggregate("", (current, c) => current + (char.IsLetter(c) ? (c - 55).ToString() : c.ToString()));
+
+                var d = decimal.Parse(sum);
+                return ((d % 97) == 1);
+            }
+            return false;
+        }
+
+    }
+}

IBANNummerPrüfen/Program.cs

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+namespace IBANNummerPrüfen
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            IbanPrüfung iban = new IbanPrüfung();
+            iban.SetIbanPrüfungEntgegennehmen();
+        }
+    }
+}