public class Invoker
    {
        private Command _command;
        public Receiver _receiver;
        public Invoker()
        {
            _receiver=new Receiver();

        }
        public void SetCommand(string rawText)
        {
            var switchCommand = GetSwitchCommand(rawText);
            var parameters= GetParams(rawText);
            this._command = new CommandFactory().GetCommand(rawText,parameters,switchCommand);

        }
        public void ExecuteCommand()
        {
            _receiver.Execute(_command);
        }

        private string GetSwitchCommand(string rawText)
        {
            var commandArray = GetParams(rawText);

            return MenuCommand.commands.FirstOrDefault(f => commandArray[0].Contains(f))?.ToLower();
        }

        private List<string> GetParams(string rawText)
        {
            var cmds = Regex.Match(rawText, @":(!.+?)\r\n").Groups[1].Value;
            var parameters = cmds.Split(new Char[] { ' ' }).ToList();

            return parameters;
        }
    }
    public class CommandFactory
    {
        public Command GetCommand(string rawText,List<string> parameters,string switchCommand)
        {

            if (parameters.Count == 0) return new NotFound().CheckCommandParams(rawText);

            parameters.RemoveAt(0);

            switch (switchCommand)
            {
                case "!join":
                    return new Join().CheckCommandParams(parameters);
                case "!say":
                    return new Say().CheckCommandParams(rawText,parameters);
                case "!show":
                    return new Show().CheckCommandParams(rawText, parameters);
                case "!raw":
                    return new RawCommand().CheckCommandParams(parameters);
                case "!help":
                    return new NotFound().CheckCommandParams(rawText);
                default:
                    return new NotFound().CheckCommandParams(rawText);

            }
        }
    }