Short exercise for event-driven programming

Modify the letter package so that it handles the backspace key appropriately:

• If the current JLabel is not empty, then remove the last character from the text.
• If the current JLabel is empty, then make the previous JLabel to be the current (unless we're already on the 0th JLabel).
• Decrement the count for the deleted character.

The code from class can be found here: letter.tar.

Please turn in any file you have modified by email. Due Wednesday.