๐Ÿš€Measuring Bottlenecks & Optimizing CodeWORKSHOP
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Step 1

Use `timeit.timeit` to compare two string-building implementations: (1) concatenating with `+=` in a loop, and (2) using `''.join()`. Run each 1,000 times and print both elapsed times and the speedup ratio. Which approach wins and why?

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