• demo.mp4 explains the user interface. See video
• just compile and run app.c
• Admin password is 61770

• I used some ANSI COLORS to style the terminal output. #define RED "\x1b[31m" ... #define RESET "\x1b[0m" It's very simple to use printf("\n" GREEN "Colored String" RESET "\n "). Source

• It should exactly look like this to make the programs work properly.
• 404 command will automatically erase/update the files. We don't need to manually clear them.
• Image

• 0. Menu
  Image
  
• 1. New Card
  Image
  
• 2. Delete Card
  Image
  
• 3. Unblock Account
  Image
  
• 4. History
  Image
  
• 5. Statistics
  Image
  
• 6. Search User
  Image
  
• 7. Exit
  will exit the program.

• registration
  Image
  
  • log in
    Image
    
  • recharge
    Image
    

  ---

This project is for educational purpose only.

• _SETUP()
  Creates directories and files. Initializes default values. First-time setup.

• generateCardAndAppend()
  Generates random card numbers. Saves to appropriate file.
• removeCard()
  Deletes specific card from FreshCards.
• deleteCard()
  Finds and removes card by number.
• deleteDialog()
  UI for card deletion options.

• unblock()
  Removes number from blocked list.
• showBlockList()
  Displays all blocked numbers.
• unlockAccount()
  Unblocks user account.
• showStatistics()
  Displays sales and stock data.
• showHistory()
  Shows all transactions.
• searchUserTransaction()
  Finds transactions by phone number.

• updateSold()
  Increments sold card count.
• updateAdminBalance()
  Updates admin's balance.
• commitRecharge()
  Validates and processes card recharge.

• showMinutes()
  Displays user's remaining minutes.
• updateBalance()
  Updates user's minute balance.
• isBlocked()
  Checks if user is blocked.
• logOut()
  Clears current session.
• clientPanel()
  Main user interface handler.

• formatDate()
  Converts timestamp to readable format.
• resetCurrentNumber()
  Clears current user session.
• checkIfBlocked()
  Verifies if current user is blocked.

• adminPanel()
  Admin control interface.
• showDialog()
  User menu interface.
• main()
  Entry point with role selection.