Need help on how write this program.

Question

"The Eversoft Eraser Company has a list of its customers’ names (not necessarily in alphabetical order) and telephone numbers in a file named "customer" with records of the following form:
last_name (String), first_name (String), phone_number (String)
a. Allow the user to input a last name, then search the file and display all names and phone numbers corresponding to that last name.
b. Load the file into parallel arrays and display the list of customers’ names and phone numbers in alphabetical order."

Answer 1

Write a C program that reads the first names of up to 10 salesmen