class Program
    {
        static void Main(string[] args)
        {
            string result = BuildMsg(true);
        }

        public static string BuildMsg(bool takeFirstPath)
        {
            StringBuilder msg = new StringBuilder();
            if (takeFirstPath)
            {
                msg.Append("A problem occurred.");
                msg.Append("\nThis is a problem.");
                msg.Append("imagine much more text");
            }
            else
            {
                msg.Append("This path is not so bad.");
                msg.Append("\nIt is only a minor inconvenience.");
                msg.Append("Add more detailed diagnostics here.");
            }
            return msg.ToString();
        }

        private static string SecondPath()
        {
            throw new NotImplementedException();
        }

        private static string FirstPath()
        {
            throw new NotImplementedException();
        }

        public static string BuildMsg2(bool takeFirstPath)
        {
            if (takeFirstPath)
            {
                return FirstPath();
            }
            else
            {
                return SecondPath();
            }
        }
    }