Design a C program to act as a simple phonebook application. Phonebook entries consist of names and phone numbers stored in a Linked list.
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Create functions to:
? Add a new contact: Prompt for a name and phone number, validate them
(e.g., minimum name/phone number length), and append a new line with the
data to the file.
? Display all contacts: Read and display each contact's name and phone
number in a clear format.
? Search for a contact by name: Allow the user to enter a name. Search for
matching names or partial names (using string search algorithms like strcmp)
and display corresponding entries.
? Delete a contact: Provide an option to delete a contact by name. Find the
entry, remove its line from the file, and rewrite the remaining content.
