Sanitizing web pages

Search engines like Google have programs called web-scapers which visit webpages and scrape the information
* displayed on the webpage. The displayable information is contained in html tags like p, table, h2 etc.
* When we make a GET request for a webpage, the HTML that is returned can also contain tags like script which often
* do not correspond to the displayable content on the webpage. Information inside script tags is not used by scapers
* and they often ignore these tags in the HTML. Write a class called WebPageSanitizer which implements a static method
* called String sanitize(String html) which removes all script tags and the information that they encapsulate and returns
* a sanitized version of the HTML string.
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