Command Line Interface to manage a contact list

• Show all your contacts
• Add a new contact
• Search a contact by their name
• Delete an existing contact
• Keep data inside a contacts.txt

• Format the phone numbers using dashes
• Allow formatting phone numbers with different lengths
• Warn user when entering duplicate contact... provide a (Y/N) response
  
• Keep columns equally spaced
• Add or trim spaces as needed
• Include email

• Email verification check: 1 @ and ".com", ".edu", or ".mil"
• Allow contact modifications
• [] Add Sort and run it alphabetize contact.txt by last name

• The text file should contain one contact per line
• When the application starts, the contact list should be read from the file.
• Before the application exits, the contacts file should be rewritten.

1. Contact Text: key, name (first & last), phone, email

2. Contact class:
   Fields: (key, fName, lName, phone, email)
   Methods: (set, get)
   Description: At the moment, we do not need contact objects. This could be used later if the scope of the project demands it.

3. ContactManager class:
   Fields: (filename, directory, fileData, directoryPath, filePath)
   Methods: (create, read, update, delete, saveFile)
   Description: Manages CRUD data between application and data file

4. ContactPrograms:
   Fields: (ContactManger[inst], Input[inst])
   Methods: (readAll, findContact, checkContact, modContact; sortContacts; deleteContact)
   Description: Combines cm crud functions into larger programs the user selects within the ca menus

5. ContactApplication:
   Fields: (FIELDS)
   Methods: (readAll, findContact, checkContact, modContact; sortContacts; deleteContact)
   Description: Provides user with menus, calls program according to user selection, includes overall application run and terminate function

6. UI: Input:
   Fields: (FIELDS)
   Methods: (getString, getPhone, getEmail, checkName, checkPhone, checkEmail)
   Description: Manages user inputs, checks for errors