create a class to construct a string for a node of try statement
create a class to construct a string for a node of catch clause
create a class to construct a string for a node of catch clause
create a class to construct a string for a node of finally block
create a class to construct a string for a node of synchronized statement
create a class to construct a string for a node of while statement
[BUG_FIX] modify the conditions for removing the final dividers for try, finally, and else