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Here is an example C function that separates digits and compares them:

int compareDigits(int x, int y) {
    int digitX, digitY;

    while (x != 0 && y != 0) {
        digitX = x % 10;
        digitY = y % 10;

        if (digitX != digitY) {
            return digitX - digitY;
        }

        x /= 10;
        y /= 10;
    }

    return x - y;
}

This function takes two integers, x and y, as input. It separates the digits of each number using the modulo operator (%) and compares each corresponding digit. If the digits are not equal, it returns the difference between them. If all the digits are equal, it returns the difference between the remaining numbers. This function assumes that both x and y are non-negative.