System.EncryptHelper.ClearUp C# (CSharp) Method

        public static string ClearUp(string str)
        {
            var sbd = new StringBuilder();
            int j = 0;
            for (int i = 0; i < str.Length; i++)
            {
                if (i % 2 == 0)
                {
                    sbd.Append(str[i]);
                }
                else
                {
                    j++;
                }

                if (j > TimestampLength)
                {
                    sbd.Append(str.Substring(i));
                    break;
                }
            }

            return sbd.ToString();
        }