public string Execute(IEnumerable <string> parameters)
{
IList <string> args = parameters.ToList();
if (args.Count != 4)
{
throw new InvalidBookServiceParametersExeption("Invalid numbers of parameters");
}
string title = args[0];
string genre = args[1];
string author = args[2];
string bookInStore = args[3];
var newGenre = genreServices.AddGenre(genre);
var newAuthor = authorServices.AddAuthor(author);
var addedBook = booksServices.AddBook(title, newGenre, newAuthor, bookInStore);
return($"New book {addedBook.Title} was added.");
}