RomaCalculator.Calculator.ConvertFromRomanToArabNumber C# (CSharp) Method

        public int ConvertFromRomanToArabNumber(string romanNumber)
        {
            var result = 0;
            var previousCount = 0;
            var abacus = new List<int>();

            for (int i = 0; i < romanNumber.Length; i++)
            {
                abacus.Add(ConvertFromRomanToArabDigit(romanNumber[i]));
            }

            while (abacus.Count != 0)
            {
                previousCount = abacus.Count;

                SubtractThatPossible(abacus);

                result = AddUpAllIfPossible(abacus, previousCount, result);
            }
            return result;
        }