/**
     * Removes a book by title.
     */
    public void remove(String bookTitle) {
        for(int i = 0; books.length < i; i++){
            if(books[i].getTitle().equals(bookTitle)){
                books[i] = null;
            }
            else
            {
            System.out.println("");
            }
        }
    }

    /**
     * Adds a new book.
     */
    public void add(Book book) {

        if(book != null && books.length < 100){
            int i = 11;
            books[i] = book;
            i++;
        }
        else{
            System.out.println("Book Storage is Full.");
        }

    }

    /**
     * Gets a book by title.
     */
    public Book getByTitle(String title) {
        for(int k = 0; books.length < 100; k++){
            if(books[k].getTitle().equals(title)){
                return books[k];
            }
            else{
                return null;
            }

    }
        return null;
    }