8_kyu_Convert_number_to_reversed_array_of_digits.c

/*
Convert number to reversed array of digits

        Given a random non-negative number, you have to return the digits of this number within an array in reverse order.
Example(Input => Output):

35231 => [1,3,2,5,3]
0 => [0]
*/

#include <stddef.h>
#include <inttypes.h>

void digitize (uint64_t n, uint8_t digits[], size_t *length_out) {
    unsigned idx = 0;
    do {
        digits[idx++] = n % 10;
        n /= 10;
    } while (n > 0);
    *length_out = idx;

}