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Sounds like it's time for a good night's sleep. Then take a step back and really think about what you need to do, one small step at a time. Recommended reading:...

Step through your code one line at a time.

You get a single String which presumably holds multiple words and a period.
You pass that String into your reverseRecursively method.
You create a new...

You tell us. What does the code do exactly? What happened when you stepped through it with a debugger, or at least added some print statements, to determine exactly where the program's execution...