Remove prints that shouldn't be printed by default

[kuzmoyev]

closes #645

[ftnext]

Thanks for this pull request.

I think these print functions are not needed, too.
Deleting them is more suitable rather than commenting them out.

Commenting out is a great debugging technique.
But in a library implementation, it is not really suitable.

[kuzmoyev]

Yes, I agree. I've just seen commented-out prints on other lines, so thought this is the approach in the project. I will delete them (and other commented-out prints)

[ftnext]

LGTM
Thank you so much for making SpeechRecogniton's code clean!

I will run the GitHub Actions and merge this after all passed.