int *build_array(char **strs, int size) {
  int *int_array = malloc(sizeof(int) * size);
  for(int i = 0; i < 4; i++){
    int_array[i] = strtol(strs[i], NULL, 10);
  }
  return int_array;
}

**strs is an array filled with number as strings. convert them all into ints, put them into an int array, and return the int array