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DIY: Expressive words

Understand how to identify and count stretchy words by extending repeated characters in strings. Learn to implement the expressiveWords function, mastering techniques useful for coding interviews focused on string manipulation and pattern matching.

Problem statement

Given a string, S, and a list of words, return the number of words that are stretchy.

A word in words is stretchy with respect to S if S can be derived by extending the letters of the word. Here is the extend rule:

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