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Counting Sentences

Description

In this lab, you'll be adding an instance method to Ruby's String class. We generally want to avoid altering built-in classes (especially if we are working with other people), but in this case, we're not overwriting any methods, and it's a good exercise in OO programming.

What we'd like to be able to do is call a count_sentences method on a string, and get back a, well, count of sentences in that string. In other words:

"This is a string. It has three sentences. Right?".count_sentences
# => 3

Instructions

Get all the tests to pass by completing the body of the count_sentences method in count_sentences.rb.

Run the tests using the learn command from the root of the project.

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