Solution#512
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Review Summary
The core file copying functionality works correctly with all required validations: source file existence check, source-is-file validation, destination-not-directory check, and same-location prevention. Error handling properly uses console.error() as specified. The only improvement to consider: remove the async keyword from the copy function since all fs operations are synchronous. While this doesn't break anything, having async without any await statements is misleading and could confuse developers about the function's behavior.
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Footnotes
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| const fs = require('fs'); | ||
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| async function copy() { |
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The async keyword is unnecessary here since all fs operations used are synchronous (existsSync, statSync, copyFileSync). Either remove async or use the Promise-based fs.promises API to make it truly async.
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implement copy function, all test cases success