void Input(const struct BOOK* book)
{
    printf("Input category: science(0), cookbook(1), classic(2)");
    scanf("%u", &book.category);

    printf("Input author:");
    scanf("%29s", book.author);
    fflush(stdin);

    printf("Input author:");
    scanf("%29s", book.author);
    fflush(stdin);

    printf("Input the year of publishing");
    scanf("%u", &book.published);

    printf("Input the book price ");
    scanf("%u", &book.cost);
}