{% assign social_urls = '' %}
{% if site.github_username %}
    {% assign social_urls = social_urls | append: '"https://github.com/' | append: site.github_username | append: '",' %}
{% endif %}
{% if site.facebook_username %}
    {% assign social_urls = social_urls | append: '"https://www.facebook.com/' | append: site.facebook_username | append: '",' %}
{% endif %}
{% if site.twitter_username %}
    {% assign social_urls = social_urls | append: '"https://twitter.com/' | append: site.twitter_username | append: '",' %}
{% endif %}
{% if site.medium_username %}
    {% assign social_urls = social_urls | append: '"https://medium.com/@' | append: site.medium_username | append: '",' %}
{% endif %}
{% if site.instagram_username %}
    {% assign social_urls = social_urls | append: '"https://www.instagram.com/' | append: site.instagram_username | append: '",' %}
{% endif %}
{% if site.linkedin_username %}
    {% assign social_urls = social_urls | append: '"https://www.linkedin.com/in/' | append: site.linkedin_username | append: '",' %}
{% endif %}
{% if site.telegram_username %}
    {% assign social_urls = social_urls | append: '"https://t.me/' | append: site.telegram_username | append: '",' %}
{% endif %}