Extended test coverage, improved pop() to handle exceptions
Reorganized file structure
Implemented proper_parens() and associated tests
Implemented proper_parens() and associated tests
Fixed bug that caused funciton to return wrong result if there was an int in the string
Made changes suggested my Mark
Implemented code for Queue data structure as well as associated tests
merging due to conflict error
Removed all the codes I did not work with Ian aka linked_list