implement integer mul and div in virtual.ml
pretty print for Syntax.t
implement lsl & lsr
shift test
Add Instruction Counter
position of expression
minor fix
associativity of lsl & lsr and other minor bug
fix header
Merge remote-tracking branch 'origin/hrontan' into developer
create_array -> Array.create
Merge branch 'wtr816' into developer
fix virtual.ml
Merge branch 'wtr816' into developer
chmod a+x raytracer/preprocess.py
Initilaize Stack Pointer
Merge branch 'developer' of github-hrontan:hrontan/CoreWe3 into developer
pretty print fix
Error Print for UnifyError
fix preprocessor