code refactored. space handing moved into it's separate class.
Last Working code to be refactored.
In Evaluator String Expression Field Removed.
Logic of Filtering Operands and Operators has changed.
Two Fields in Expression List of Operands and List of Operators Added.
Expression handles List of Expression and have a double value.
Expression handing expression as an object. Yet to separate parser.
Parsing logic moved to separate class.
Operator class Refactored.
Working code starting of day 10-02-14
Expression test added