using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<string> list = new List<string>() {"truc", "I love toto", "next", "chocolate", "tata tata", "", "something"};

        WordsFilter(list);

    }

    private static void WordsFilter(List<string> newText)

{

        string[] WordsList = new string[] { "toto", "tata" };

        for (int i = 0; i < newText.Count; i++)

        {

            for (int x = 0; x < WordsList.Length; x++)

            {

                if (newText[i].Contains(WordsList[x]))

                {

                    newText.RemoveAt(i);

                    if (i + 1 < newText.Count)

                        newText.RemoveAt(i);

                }

            }

        }

        // print

        foreach(var item in newText)

        {

            Console.WriteLine(item);

        }

    }

}