expending snippets
Merge branch 'Yulong/ExpendingSnippets' of
github.com:11791-2/team-project2 into Yulong/ExpendingSnippets

Conflicts:
	project-team02/src/main/java/team2/SnippetsRetrieval.java
Merge branch 'master' of github.com:11791-2/team-project2 into Yulong/TitleSnippets
add the possible snippet with title section
add comment and remove unnecessary output for test