In C Code please! Thank you! no strings please!

Implement an automated number-to-text conversion system for a phone company. Prompt the user to input an integer and convert each digit to the appropriate text word. The integer can be of variable length, but no longer than 10 digits. Assume that no phone number starts with a zero. Do not use strings or any function from the string library. Sample Output Enter your phone number: 2345769854 two three four five seven six nine eight five four