incomplete hmwk, no overdraft protection

This hmwk is not complete. I got stuck on the overdraft protection and tried for hours to get it to work but it was in vane. I have a sample of what I was trying to run on lines 57 - 70. 
All other features work, including:
- depositing or withdrawing funds in real time
- no negative withdrawals
- red if balance = $0, grey of > $0

I wanted to be sure to submit a pull request despite not being done to ensure I got something in before the morning deadline. I intend to continue working on and completing this assignment in the next 24 hours.