add Programmyday form github

UmlautsExtentions/Program.cs

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+using System.Security.Cryptography.X509Certificates;
+
+namespace UmlautsExtentions
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            string input = "Ueber ein leben hinaus, aeßert man sich nicht.";
+            Console.WriteLine(input.Umlauts());
+        }
+    }
+    static class UmlautsExtentions
+    {
+        public static string Umlauts(this string input)
+        {
+            return input.Replace("ae","ä").Replace("oe","ö").Replace("ue","ü").Replace("Ae", "Ä").Replace("Oe", "Ö").Replace("Ue", "Ü");
+        }
+    }
+}

UmlautsExtentions/UmlautsExtentions.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>