Renamed all folders to have 2 digit numbers

lab01/ex3.txt

lab02/Makefile

lab02/README.md

lab02/link_emulator/Makefile

lab02/link_emulator/lib.c

lab02/link_emulator/lib.h

lab02/link_emulator/link.c

lab02/link_emulator/link.h

lab02/link_emulator/queue.c

lab02/link_emulator/queue.h

lab02/recv.c

lab02/run_experiment.sh

lab02/send.c

lab03/Makefile

lab03/common.c

lab03/common.h

lab03/link_emulator/Makefile

lab03/link_emulator/lib.c

lab03/link_emulator/lib.h

lab03/link_emulator/link.c