add 00_Alternate_Langage folder and move alternate ports there

00_Alternate_Languages/63_Name/csharp/StringExtensions.cs

@@ -0,0 +1,41 @@
+using System;
+
+namespace Name
+{
+    public static class StringExtensions
+    {
+        private const int ConsoleWidth = 120; // default console width
+
+        public static string CentreAlign(this string value)
+        {
+            int spaces = ConsoleWidth - value.Length;
+            int leftPadding = spaces / 2 + value.Length;
+
+            return value.PadLeft(leftPadding).PadRight(ConsoleWidth);
+        }
+
+        public static string Reverse(this string value)
+        {
+            if (value is null)
+            {
+                return null;
+            }
+
+            char[] characterArray = value.ToCharArray();
+            Array.Reverse(characterArray);
+            return new String(characterArray);
+        }
+
+        public static string Sort(this string value)
+        {
+            if (value is null)
+            {
+                return null;
+            }
+
+            char[] characters = value.ToCharArray();
+            Array.Sort(characters);
+            return new string(characters);
+        }
+    }
+}