New extension: File Search (grep)

The next extension for the grep challenge is now live: File Search.

This is what grep is designed for: scanning input files and printing lines that match a given pattern.

By the end of this extension, your grep implementation will be able to search through both individual files and entire directories.

Here’s the stage breakdown:

Please give this a try and let us know how it can be improved! @ryan-gang (author of this extension) and I will be available here to help out with any tester or instruction-related issues.

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