Add enchantment map to a series of books?

I am making a plugin that takes the enchanted item in your hand and breaks it down, giving you books with the enchants the item had. This is my first time working with maps and I'm a bit confused. Let's assume that Map enchants is a map of the enchantments on the item in hand.
How would I go about iterating through it and adding each enchant to a book?

Code:java

    public boolean onCommand(CommandSender sender, Command cmd, String label, String args[]) {
        Player p = (Player)sender;
        ItemStack is = p.getItemInHand();
 
        if(cmd.getName().equalsIgnoreCase("enchantbreak")){
            if(is != null){
                p.setItemInHand(is);
                if(is.getEnchantments().isEmpty()){
                    p.sendMessage("Item must be enchanted!");
                }
                else{
                    Map<Enchantment, Integer> enchants = is.getEnchantments();
                    convertToBooks(enchants);
                }
            }
            return true;
        }
 
        return false;
    }
 
    private Map<Enchantment, Integer> convertToBooks(Map<Enchantment, Integer> enchants) {
       // where I need to iterate through enchants and add each enchant to a book
        return enchants;       
    }