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user@intervues:~/$
Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation.
Note: You are not allowed to use any built-in function which evaluates strings as mathematical expressions, such as eval().
'+' is not used as a unary operation (i.e., "+1" and "+(2 + 3)" are invalid).
'-' could be used as a unary operation (i.e., "-1" and "-(2 + 3)" are valid).