fix typo
update c/common.bun
support string's add operator in c generator
add test tool for CGenerator
bug fixed: support function parameter
modifying typecheck/generator strategy
adding test_java
Merge branch 'master' of github.com:libbun/libbun
adding duplicate method Dup() to BNode
refactoring BNode constructor
renaming B** with LibBun**
Merge pull request #58 from imasahiro/update-c-gen

Update CGenerator
fixed of merge conflicts
insert StmtNode to TopBunBlock