I need the method that has the ability to turn a long string like this:

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Pellentesque
pulvinar turpis a nisi. Cras id elit. Aliquam vitae pede nec lacus
elementum lacinia. Ut aliquam vehicula sem.

into a shorter string like this:

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Pellentesque
pulvinar turpis...

My problem is that I can't remember what the method is called. I looked
through the whole Ruby String documentation
(http://ruby-doc.org/core/classes/String.html) but I couldn't find it.
Can anyone remember what it's called?
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