Guard NamedInitializer

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
Add guard if struct or union in visit_Decl

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
Merge branch 'feature/fix-struct-union' into develop
fix: generic_visit after visiting Label

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>