internal Book(string title, string author)
{
BookValidator.ValidateForCreation(title, author);
Title = title;
Author = author;
}
internal void UpdateAuthor(string newAuthor)
{
BookValidator.ValidateAuthor(newAuthor);
Author = newAuthor;
}
internal void UpdateTitle(string newTitle)
{
BookValidator.ValidateTitle(newTitle);
Title = newTitle;
}