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I am glad you have it working.

Please describe in more detail. Is there one space too many or one space too few.
Where is it?
Copy the output and paste it here will comments about the space problem.

Print the newline AFTER printing the ?
In other words: print the characters one by one and if the last one printed was a ? print a newline

The String class's indexOf and substring methods could be used to find the end of each sentence and extract the sentence.
Or a newline character could be inserted in the String following the...