Adding additional bot command checks toa void invalid configurations

TelegramBotBase/Commands/Extensions.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using Telegram.Bot.Types;
 
@@ -20,6 +21,16 @@ public static class Extensions
             scope = BotCommandScope.Default();
         }
 
+        if (string.IsNullOrEmpty(command))
+        {
+            throw new ArgumentNullException(nameof(command), $"{nameof(command)} parameter can not be null or empty");
+        }
+
+        if(command.StartsWith(Constants.Telegram.BotCommandIndicator))
+        {
+            throw new ArgumentException($"{nameof(command)} parameter does not have to start with a slash, please remove.", $"{nameof(command)}");
+        }
+
         var item = cmds.FirstOrDefault(a => a.Key.Type == scope.Type);
 
         if (item.Value != null)