Task 4 gen_accNumber(N) => Generates the 10 digit account number
collect_info() => Collects client full details and stores to customer.txt file
landing_page() => Home page when app is launched staffLoginCheck() => Collects staff details and validates against stored information staff.txt file can be checked to obtain required staff details for login
userSession(staffUsername, login_time) => tores username and time of login in userSession.txt file The userSession.txt file will be deleted when staff logs out
dashboard() => This function produces the Staff Personal Dashboard