Creating a comma separated list of tags

# in the view module
def format_tags(conn, tags) do
  tags
  |> Enum.map(fn tag -> link(tag.name, to: tag_path(conn, :show, tag.name) end)
  |> Enum.intersperse(", ")
end

# in the template
<%= format_tags(@conn, @video.tags) %>
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