Find all void functions

// FuncDeclarator [ parent::DeclOrStmt / DeclSpecs[*]::BuiltinType [ @Spec = KTC_BUILTINTYPE_VOID ] ]

1   // find this function
2   void f() { } // and this one static
3   void g() { } // no match - return type is not void 
4   inline int h() {
5   
6   return 0;
7   } // no match - return type is a pointer to void
8   
9   void *j() {
10  
11  return NULL;
12  }