Create a software that changes stopwords into code

I want you to develop a system whereby stopwords (i.e. to, the, was, etc..) that the search engine ignore (can find a list here [login to view URL]) are altered with code that is invisible to the naked eye, but is visible to search engines. In essence, to readers the text appears “normal” with no alterations, but to search engines it appears as 100% Unique to Search Engines and it passes Copyscape at 100% with no duplicate content. And it does this without altering or changing the readability of the article nor the SEO optimized keyword. I would like it to be simple to use, where I could paste my article into a section and hit submit and within seconds have the newly revised article with code appear that will be 100% unique but reads exactly the same to humans. See attached file for an example of the real and coded article.