public string GetLeaveMessage(string nickname)
        {
            var leaveMessage = _leaveMessagesCollection.FindRandomOrDefault(
                x => x.Nickname == nickname || x.Nickname == "all",
                DefaultLeaveMessage);

            return(leaveMessage.Template);
        }
        public string GetGreeting(string nickname)
        {
            var greeting = _greetingsCollection.FindRandomOrDefault(
                x => x.Nickname == nickname || x.Nickname == "all",
                DefaultGreetMessage);

            return(greeting.Template);
        }