Revert "4th Class - More Tests have been added to binary operator nodes add,minus,mult & div."

This reverts commit e4c725d3c0f8e066e7215ce1c4e6ebdeb1cf64ce.
Revert "Revert "4th Class - More Tests have been added to binary operator nodes add,minus,mult & div.""

This reverts commit 8bde1531bd41c1383fd385aad854e88de4aefa99.
First step into new architecture refactorization, we see that we will need a calculator class to perform the evaluation of sintax tree in stead of have one architecture for all.