Unary Operators Redundancy

[GuptaManan100]

Overview of the Issue

The parser does not remove unary operators which are redundant. For example :- Parsing SET S= +++-++-+(4+1) results in set S = + + + - + + - +(4 + 1) whereas parsing SET S= +++-++-+4 produces set S = 4.

Reproduction Steps

The issue can be reproduced by adding a test case to the parser tests.