Merge pull request #13 from XxShenglixX/master

Added Utility module, Reposition input and output source file
Added mode select for LZ78_Decompressor function
Change to Modified LZ78, modify test code for it and added comments
Change all the index from 0 to 1
Merge branch 'master' of https://github.com/darklord1310/Mini_Project_LZ78