find_subtitle.md

• code description: find the subheadings in a privacy policy document. The local path of the crawled privacy policy is given to the findTitleLabel function to find all the subheadings on the privacy policy page
• input: the raw HTML page of privacy policy document
• output: a list of subheadings in the privacy policy document. If no subheading cannot be found, a TitleError is given. We find this is very rare.