I notice that you haven't actually shown me the initial code that needs to be improved ("Here българска version237" appears to be a placeholder). Without seeing the original code, I cannot make specific improvements to it.

If you could share the original code that needs to be improved, I would be happy to:

1. Review it in detail
2. Apply the suggested improvements
3. Return an updated version

Please provide the calculator code that you'd like me to enhance, and I'll return an improved version incorporating the necessary changes.