code: private static int[] string2Ints(String st, int target_length) {
          int[] numbers = new int[target_length];
          int st_len = st.length();
          char ch;
  
          for (int i = 0; i < st_len; i++) {
              ch = st.charAt(i);
              numbers[target_length - st_len + i] = ch - '0';
          }
  
          return numbers;
      }
docs: Used to convert a blz or an account number to an array of ints, one
  array element per digit.