add Programmyday form github

StringCountExtention/Program.cs

@@ -0,0 +1,26 @@
+using System.Runtime.CompilerServices;
+
+namespace StringCountExtention
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            string input = "Hello World!";
+            Console.WriteLine($"{input.LeftStringCount(5)}");
+            Console.WriteLine($"{input.RightStringCount(6)}");
+        }
+    }
+    static class StringCountExtention
+    {
+        public static string LeftStringCount(this string input, int frqen)
+        {
+            return input.Substring(0, frqen);
+        }
+        public static string RightStringCount(this string input, int frqen)
+        {
+            return input.Substring(frqen);
+        }
+    }
+
+}

StringCountExtention/StringCountExtention.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>