test case for defalt sort and default reverse sort added
main function of Head  is sapared in HeadClient class
main function of Tail  is separated in TailClient class
main function of Uniq  is separated in UniqClient class
main function of WC  is separated in
WcClient class
main function of Sort  is separated in SortClient class
main function of Cut  is separated in CutClient class
main function of RemoveSpace  is separated in RemoveSpaceClient class
cutClient file moved in Client package