Review Summary

Your implementation correctly handles the core file copying functionality required by the task. The code properly reads and writes files using synchronous operations, detects when source and destination are identical, and handles errors appropriately. The only issue identified is a minor error message discrepancy at line 33 where the text says 'Source is not a file' but should say 'Destination is not a file' since that validation checks the destination path. This is a cosmetic/clarity issue rather than a functional blocker—your code still correctly identifies and handles the error condition, just with an imprecise message string. All checklist requirements are met: Correct file copying implementation using fs.readFileSync/fs.writeFileSync, Same-location detection and graceful exit, Plain file support without flags (exactly two arguments). This is a solid implementation. The error message fix is straightforward if you'd like to improve clarity: simply update the string on line 33 from 'Source is not a file' to 'Destination is not a file'. Great work meeting all the core requirements!

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