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Figure out how the code worked and made modifications to the code to make it work the way you want.
There is no magic way. The code has to be analyzed and debugged to see how it works.

Start debugging the code to see how it works and how changes to the code changes the way it works.
Try changing the duration of the sleep to see what happens.

The posted code does not compile without errors because of missing classes.

Where would those messages be printed?

Where are these messages printed, I don't see them in the posted code?