Expression evaluation #14
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I've added an uitility to evaluate expressions. It can now handle the operations along with brackets. I've used Postfix evaluation and Infix to Postfix conversion.
With new code, I've refactored to remove redundant code as well.
I've not worked around in bracket evaluation (i.e for input 3(6), the answer would be 36 and not 18). This is related issue in Infix to Postfix conversion. It can be worked around. I'll update it in next PR.