/// <summary>
 /// Conversion list.
 /// </summary>
 /// <param name="list">Necessary list.</param>
 /// <param name="somethingFunction">"Sly" function.</param>
 public void Map(List list, Func<int, int> somethingFunction)
 {
     int end = list.SizeOfList();
     var temp = list.First();
     for (int i = 0; i < end; ++i)
     {
         temp.Value = somethingFunction(temp.Value);
         temp = temp.Next;
     }
 }
 /// <summary>
 /// Storage function.
 /// </summary>
 /// <param name="list">Necessary list.</param>
 /// <param name="value">Started value.S</param>
 /// <param name="function">"Sly" function.</param>
 /// <returns></returns>
 public int Fold(List list, int value, Func<int, int, int> function)
 {
     int end = list.SizeOfList();
     var temp = list.First();
     for (int i = 0; i < end; ++i)
     {
         value = function(value, temp.Value);
         temp = temp.Next;
     }
     return value;
 }
        /// <summary>
        /// Filter function.
        /// </summary>
        /// <param name="list">Necessary list.</param>
        /// <param name="check">"Sly" function.</param>
        /// <returns></returns>
        public List Filter(List list, Func<int, bool> check)
        {
            List newList = new List();
            int end = list.SizeOfList();
            var temp = list.First();
            var temNewList = newList.First();

            for (int i = 0; i < end; ++i)
            {
                if (check(temp.Value))
                {
                    newList.InsertToEnd(temp.Value);
                }
                temp = temp.Next;
            }
            return newList;
        }