update Makefile
bug fix
add output for group
merge from master
add output for group attack's exception
delete unnecessary file
fix coding style
add output for group attack's exception

delete unnecessary file

fix coding style
Merge branch 'dev_zch' of github.com:ByzanTine/eecs381p6 into dev_zch
Merge pull request #10 from ByzanTine/dev_zch

Dev zch