HTML is a markup language that is used by web documents.
HTML uses tags to control how text is formatted: like "<i>Yay</i>" which renders "Yay" in
italics.
In this example, the "i" tag makes <i></i> which surround the word "Yay".
Given a tag
and word
String
s, create the HTML string with tags around the word: such as
"<i>Yay</i>".