task14

using System;

public class Program
{
    public static void Main(string[] args)
    {
        Random random = new Random();

        string[] stringsFirst = CreateStrings(random);
        PrintStrings(stringsFirst);

        string[] stringsSecond = CreateStrings(random);
        PrintStrings(stringsSecond);

        List<string> stringsConcat = ConcatStrings(stringsFirst, stringsSecond);
        PrintStrings(stringsConcat.ToArray());

    }

    public static string[] CreateStrings(Random random)
    {
        int stringsAmountMin = 3;
        int stringAmountMax = 20;

        int numberMin = 0;
        int numberMax = 10;

        int stringsAmount = random.Next(stringsAmountMin, stringAmountMax);

        string[] stringsTotal = new string[stringsAmount];

        for(int start = 0; start < stringsAmount; ++start)
        {
            int numberRandom = random.Next(numberMin, numberMax);
            stringsTotal[start] = numberRandom.ToString();
        }

        return stringsTotal;
    }

    public static List<string> ConcatStrings(string[] stringsFirst, string[] stringsSecond)
    {
        int indexStart = 0;
        int stepForward = 1;

        List<string> stringsTotal = new List<string>();

        stringsTotal.AddRange(stringsFirst);
        stringsTotal.AddRange(stringsSecond);
        stringsTotal.Sort();

        string stringCompare = stringsTotal[indexStart];

        for(int start = indexStart + stepForward; start < stringsTotal.Count;)
        {
            if(stringCompare == stringsTotal[start])
            {
                stringsTotal.RemoveAt(start);
            }
            else
            {
                stringCompare = stringsTotal[start];
                start += stepForward;
            }
        }

        return stringsTotal;
    }
    public static void PrintStrings(string[] strings)
    {
        Console.WriteLine("Amount of strings is " + strings.Length);
        Console.WriteLine("\nAll strings : ");

        foreach(var element in strings)
            Console.WriteLine(element);

        Console.WriteLine("\n");
    }
}