Add Unit Test for - all-words-in-trie in Trie

[TheSTL]

👽 What is required?

The algorithm is here : all-words-in-trie

• Follow the ESLint rules strictly
• Follow the filename and folder structure strictly
• Since the Contribution Guide is not ready yet, go through the codebase pattern and add tests accordingly

Thank You!

[garrowp]

I can take this one