namespace ReverseText
{
    class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Enter a text to be reversed\nType '!exit' to quit" );
            while (true)
            {
                Console.Write("Enter text: ");
                string userInput = Console.ReadLine();

                if (string.IsNullOrWhiteSpace(userInput))
                {
                    Console.WriteLine("No text entered!");
                    continue;
                }

                else if (userInput == "!exit")
                    break;

                else if (userInput.Length == 1)
                {
                    Console.WriteLine("Text is too short (one character), nothing to be reversed!");
                    continue;              
                }

                var reversed = TextReverse(userInput);
                Console.WriteLine("Reversed text: " + reversed);
            }
        }

        public static string TextReverse(string userInput)
        {
            var array = new char[userInput.Length];

            for (var i = userInput.Length; i > 0; i--)
            {
                array[userInput.Length - i] = userInput[i - 1]; 
            }

            var reversed = new string(array);
            return reversed;
        }

    }
}