RomanNumber rnAdd(RomanNumber number1, RomanNumber number2) {
   RomanNumber returnValue;

   rnRemoveSubtractive(&number1);
   rnRemoveSubtractive(&number2);

   returnValue = rnConcatinate(number1, number2);
   rnSort(&returnValue);
   rnConsolidate(&returnValue);
   rnRewriteSubtractive(&returnValue);

   return returnValue;
}
RomanNumber rnSubtract(RomanNumber number1, RomanNumber number2) {
   rnRemoveSubtractive(&number1);
   rnRemoveSubtractive(&number2);

   rnEliminateDuplicates(&number1, &number2);

   while (number2.Size > 0) {
      rnBreakdownDigit(&number1, &number2);
      rnEliminateDuplicates(&number1, &number2);
   }

   rnConsolidate(&number1);
   rnRewriteSubtractive(&number1);

   return number1;
}
} END_TEST

/*************** Testing Remove Subtractive with complex value ****************/
START_TEST(substitute_for_any_subtractives_complex_subtractive_value) {
   RomanNumber rn = newRomanNumber("MCMXCIX");

   rnRemoveSubtractive(&rn);

   ck_assert_str_eq("MDCCCCLXXXXVIIII", to_string(rn));
} END_TEST
} END_TEST

/* Testing a simple number consisting of only a single value needing conversion */
START_TEST(substitute_for_any_subtractives_simple_subtractive_value) {
   RomanNumber rn = newRomanNumber("IV");

   rnRemoveSubtractive(&rn);

   ck_assert_str_eq("IIII", to_string(rn));
} END_TEST
} END_TEST

/*** A single digit can not be out of order, so it should not change value ****/
START_TEST(substitute_for_any_subtractives_single_digit_value) {
   RomanNumber rn = newRomanNumber("I");

   rnRemoveSubtractive(&rn);

   ck_assert_str_eq("I", to_string(rn));
} END_TEST
} END_TEST

/********* Testing Remove Subtractive with static and changing values *********/
/** Also testing subtractive value two values above subtractor instead of one */
START_TEST(substitute_for_any_subtractives_with_changing_and_nonchanging_values) {
   RomanNumber rn = newRomanNumber("XIX");

   rnRemoveSubtractive(&rn);

   ck_assert_str_eq("XVIIII", to_string(rn));
} END_TEST
} END_TEST

/*******************************************************************************
 * Substitute for any subtractives in value                                    *
 ******************************************************************************/

/******* Create a function to rewrite value into additive only notation *******/
START_TEST(substitute_for_any_subtractives_in_value) {
   RomanNumber rn = newRomanNumber("MDCLXVI");
   char *before, *after;

   before = to_string(rn);
   rnRemoveSubtractive(&rn);
   after = to_string(rn);

   ck_assert_str_eq(before, after);
} END_TEST