using System;

using System.Collections.Generic;

​

List<string> randomStrings = new List<string>{"string ends", "ds and another", "her string begins", "but what wi", "will"};

string combinedString = CombineStrings(randomStrings);

Console.WriteLine(combinedString);

​

​

static string CombineStrings(List<string> strings)

{

    if (strings == null || strings.Count == 0)

        return string.Empty;

    string combinedString = strings[0];

    for (int i = 1; i < strings.Count; i++)

    {

        string currentString = strings[i];

        int matchIndex = GetMatchIndex(combinedString, currentString);

        if (matchIndex >= 0)

        {

            combinedString += currentString.Substring(matchIndex);

        }

        else

        {

            combinedString += " " + currentString;

        }

    }

​

    return combinedString;

}

​

static int GetMatchIndex(string str1, string str2)

{

    int minLength = Math.Min(str1.Length, str2.Length);

    for (int i = 0; i < minLength; i++)

    {

        if (str1.EndsWith(str2.Substring(0, i + 1)))

        {

            return i + 1;

        }

    }

​

    return -1;

}