In this task, you will work with the linked list of digits we have created in the lessons up to this point. You need to do the followings: A structure definition for the storage of each digit's information.

A main() function to test your code.

The functions createDigit(), append(), printNumber(), freeNumber(), readNumber() and divisibleByThree() (although you may not need to use all of these).

Your task is to write a new function changeThrees() which takes as input a pointer that holds the address of the start of a linked list of digits. Your function should change all of those digits in this linked list that equal 3 to the digit 9, and count how many replacements were made. The function should return this number of replacements.

The provided structure of the main function is as below: int main(void) { struct digit *start; start = readNumber(); printf("The number "); printNumber(start); printf("was modified in %d places. ", changeThrees(start)); printf("The new number is "); printNumber(start); freeNumber(start); return 0;}