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Bug Hunting Adventures #15: Hex String Entanglements

“Don’t be drawn into any web of entanglement created by others.”
― Steven Redhead, Life Is Simply A Game

The following routine is from a real-world project. It’s supposed to convert binary data into a printable C-string of hexadecimal digits. Even though the developer diligently wrote some unit tests, he got complaints from his fellow coders a few days later. Can you find what’s wrong with it?

Unit tests:

Solution (stay tuned.)