Redundant parentheses

Please specify for following testcsaes

(a)(b)
(a(b))
are these redundant or not redundant ?

what could possibly be wrong in my code?
code https://ide.codingblocks.com/s/123681

in first case the the brackets are not redundant…in second case i think the expression is not a valid one…
i think you want to write something like this(a*(b))…in this case also the brackets are not redundant…
your code is considering that we can have only + and variables…
approach this ques as balanced parenthesis ques and try to figure out what modifications can we do in that code to achieve our target…

redundant brackets are ex)
((a))

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