Remove comma if single metafield in Shopify Liquid

I'm struggling with remove the comma, when a single author is there for a book. What I want is Author1, Author

Below is my code

 <a href="/collections/all/{{ product.metafields.text.author_1 | handleize }}">{{ product.metafields.text.author_1 }}</a>

 {% for line_item in line_items %}
 {
 {% unless forloop.last %}
 },
 {% else %}
 }
 {% endunless %}
 {% endfor %}
 <a href="/collections/all/{{ product.metafields.text.author_2 | handleize }}">{{ product.metafields.text.author_2 }}</a>
Copy code

Can you please help me with this

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