solve some smalls errors in LRU.c. Add some test code for main.c. Created another two files linkLRU.h and linkLRU.c to implement the LRU by using a linked list
add some test code in main add resolve a small problems in LRU.c
recover Makefile
resolve small project unrelated problems
delete *~ file in remote server
Merge branch 'linkLRU'

Conflicts:
	LRU.c
	Makefile
	main.c