public string CustomFormat(string value)
        {
            StringBuilder sb = new StringBuilder();
            bool appendDot = false;
            for (int i = 0; i < value.Length; i++)
            {
                sb.Append(value[i]);
                if (value[i].Equals('('))
                {
                    appendDot = true;
                }
                else if (value[i].Equals(')'))
                {
                    sb.Remove(sb.Length - 2, 1);
                    appendDot = false;
                    sb.Append('*');
                }
                else
                {
                    if (appendDot)
                    {
                        sb.Append(',');
                    }
                    else
                    {
                        sb.Append('*');
                    }
                }
            }
            sb.Remove(sb.Length - 1, 1);
            return sb.ToString();
        }