TODO

• User can lend hold a maximum of 2 books at a given time
• User cannot lend more than 10 books a month
• User can keep the book without penalty for 20 days
• Late charges is calculated as follows:
  • 10/- per week (even one day extra in calculated as one week)
  • Add 100/- if 30 days late (in addition to weekly charges)
• If a user lost 4 books, deactivate his account
• If the user returns last 10 books before due, he/she can keep the future lending books for 30 days