add solution for node_case-transformer-server

[lesdyman]

Here is my solution for the node_case-transformer-server task. All local tests passed.

[mateacademy-ai-mentor]

Review Summary

Excellent work on this submission! I am approving your solution as it correctly implements all the requirements for the case transformer server. Your use of the native http module is effective, and the code is clean and well-structured. You've successfully handled all specified success and error scenarios, including the validations for the URL path and query parameters. The response formats for both success and error cases are perfect. Keep up the great work!

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