Add consistency checks to PrrtCodingConfiguration_create

PrrtCodingConfiguration *PrrtCodingConfiguration_create(uint8_t k, uint8_t n, uint8_t c, uint8_t *n_cycle)

{

    if (n < k) {

        PERROR("Invalid parameters: n must be greater or equal k.%s","");

        return NULL;

    }

    uint8_t r = n - k;

    if ((r > 0) && (n_cycle == NULL)) {

        PERROR("Invalid parameters: n_cycle cannot be NULL if (n-k) != 0.%s","");

        return NULL;

    }

    uint8_t sum = 0;

    for (int i = 0; i < c; ++i) {

        sum += n_cycle[i];

    }

    if (sum != r) {

        PERROR("Invalid parameters: The elements in n_cycle must sum up to n-k.%s","");

        return NULL;

    }

    PrrtCodingConfiguration *cc = calloc(1, sizeof(PrrtCodingConfiguration));

    check_mem(cc);

    cc->k = k;

    cc->n = n;

    cc->r = cc->n - cc->k;

    cc->r = r;

    cc->c = c;

    if(n_cycle != NULL) {

        cc->n_cycle = (uint8_t*) realloc(cc->n_cycle, cc->c * sizeof(int8_t));