```ruby
module ApplicationHelper
  def markdown(text)
    raw(RDiscount.new(text).to_html)
  end

  def parse(text)
    text.gsub(/\s@([a-f0-9]*)/) { link_to " @#{$1}", "https://github.com/radar/rails3book/commits/#{$1}" }
  end
end
```

Fix spacing issue in @ comments
user
```ruby
module ApplicationHelper
  def markdown(text)
    raw(RDiscount.new(text).to_html)
  end

  def parse(text)
    text.gsub(/\s@([a-f0-9]*)/) { ("&nbsp;" + link_to("@#{$1}", "https://github.com/radar/rails3book/commits/#{$1}")).html_safe }
  end
end
```
assistant