def format_authors_tags(items):
    """Format authors and tags to be compatible with Markdown metadata"""
    s = ""
    count = 0
    for item in items:
        count += 1
        if count > 1:
            # More than one author
            s += f"{item}"
            if item != items[-1]:
                s+= ","
        else:
            s += f"{item}"

    return s.strip()