char   **my_explode(char *str, char separator)
{
  char **res = NULL;
  int  nbstr = 1;
  int  len;
  int  from = 0;
  int  i;
  int  j;

  res = (char **) malloc(sizeof (char *));
  len = strlen(str);
  for (i = 0; i <= len; ++i)
    {
      if ((i == len) || (str[i] == separator))
       {
         res = (char **) realloc(res, ++nbstr * sizeof (char *));
         res[nbstr - 2] = (char *) malloc((i - from + 1) * sizeof (char));
         for (j = 0; j < (i - from); ++j)
             res[nbstr - 2][j] = str[j + from];
         res[nbstr - 2][i - from] = '\0';
         from = i + 1;
         ++i;
       }
    }
  res[nbstr - 1] =  NULL;
  return res;
}