Hello i have a c assigment could u help me

Part 1. In this program, you will simulate very large POSITIVE integers with arrays. Digits are stored in an array starting with the least significant at index 0. For example, an integer 123 is stored with 3 at index 0, 2 and index 1 and 1 at index 2. You may assume that the integers to be added or multiplied has at most 20 digits. Write the following functions: int add(int x0, int sizex, int y0, int sizey, int res), which takes two arrays x and y and their respective sizes, performs addition and stores the result into the array res. Return the number of digits of the resulting sum ie. number of digits stored into res). int multiply(int x, int sizex, int y, int sizey, int res), which takes two arrays x and y and their respective sizes, performs multiplication and stores the result into the array res. Return the number of digits of the resulting product (i.e. number of digits stored into res). int divide(int x), int sizex, int y, int sizey, int res[), which takes two arrays x and y and their respective sizes, performs integer division of x by y, and stores the result into the array res. Return the number of digits of the result int mod (int x, int sizex, int y, int sizey, int res), which takes two arrays x and y and their respective sizes, performs of x mod y, and stores the result into the array res. Return the number of digits of the result printNumber(int x), int sizex), which prints the integer represented by arrayx a main) function that creates some numbers and tests the add, multiply, division and mod operations