Program.cs

using System;

namespace GeneticPredictor
{
    public class ChildPredictor
    {
        public string MomHair { get; }
        public string MomEyes { get; }
        public string DadHair { get; }
        public string DadEyes { get; }

        internal string PredictedHair { get; }
        internal string PredictedEyes { get; }

        public ChildPredictor(string mHair, string mEyes, string fHair, string fEyes)
        {
            MomHair = mHair;
            MomEyes = mEyes;
            DadHair = fHair;
            DadEyes = fEyes;

            PredictedHair = TraitCalculator.CalculateHair(mHair, fHair);
            PredictedEyes = TraitCalculator.CalculateEyes(mEyes, fEyes);
        }

        public void ShowPrediction()
        {
            Console.WriteLine("\n-Prediction Result-");
            Console.WriteLine($"Hair color: {PredictedHair}");
            Console.WriteLine($"Eye color: {PredictedEyes}");
        }

        private class TraitCalculator
        {
            public static string CalculateHair(string h1, string h2)
            {
                if (h1 == "Black" && h2 == "Black")
                {
                     return "Black";
                }
                else if (h1 == "Brown" && h2 == "Brown")
                {
                    return "Brown";
                }
                else if (h1 == "Blonde" && h2 == "Blonde")
                {
                    return "Blonde";
                }
                else if (h1 == "Red" && h2 == "Red")
                {
                    return "Red";
                }
                else if ((h1 == "Red" && h2 == "Blonde") || (h1 == "Blonde" && h2 == "Red"))
                {
                  return "Blonde";
                }
                else if (h1 == "Blonde" || h2 == "Blonde")
                { 
                  return "Brown";
                }
                else if (h1 == "Brown" || h2 == "Brown")
                {
                  return "Brown";
                }
                else
                { 
                  return "Black";
                }
            }
            public static string CalculateEyes(string e1, string e2)
            {
                   if (e1 == "Black" || e2 == "Black")
                    {
                      return "Black";
                    }
                   else if (e1 == "Brown" || e2 == "Brown")
                   {
                    return "Brown";
                   }
                  else if (e1 == "Blue" && e2 == "Blue")
                  {
                   return "Blue";
                  }
                  else
                  {
                   return "Green";
                  }
            }
        }
    }

    class Program
    {
        static void Main()
        {
            Console.WriteLine("-Child Genetic Predictor-");

            string[] validHair = { "Brown", "Blonde", "Black", "Red" };
            string[] validEyes = { "Brown", "Blue", "Green", "Black" };

            string motherHair = ReadValidOption("Please specify Mother's hair color", validHair);
            string motherEyes = ReadValidOption("Please specify Mother's  eye color", validEyes);
            string fatherHair = ReadValidOption("Please specify Father's hair color", validHair);
            string fatherEyes = ReadValidOption("Please specify Father's eye color", validEyes);

            ChildPredictor predictor =
                new ChildPredictor(motherHair, motherEyes, fatherHair, fatherEyes);

            predictor.ShowPrediction();

            Console.WriteLine("\nThank you for using the predictor!");
        }

       static string ReadValidOption(string message, string[] validOptions)
{
    while (true)
    {
        try
        {
            Console.Write($"{message} ({string.Join("| ", validOptions)}): ");
            string input = Console.ReadLine() ?? string.Empty;

            foreach (string option in validOptions)
            {
                if (string.Equals(input, option, StringComparison.OrdinalIgnoreCase))
                {
                    return option;
                }
            }

            Console.WriteLine("Invalid option. Please choose one of the listed values.");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"An unexpected error occurred. Error details: {ex.Message}");
        }
    }
}
    }
}