int *build_array(char **strs, int size) {
    int *int_arr = malloc(sizeof(int) * size);
    char *leftover;
    strtol(*strs, &leftover, 10);
    for (int i = 0; i < size; i++){
        int_arr[i] = strtol(leftover, &leftover, 10);
        printf("%d", int_arr[i]);
    }
    return int_arr;

}
Want to return a pointer to an array of ints with size elements.
   - strs is an array of strings where each element is the string
     representation of an integer.
   - size is the size of the 
