(clean-up) clean up callback functions
(clean-up) clean up callback functions

inspiredtolive/Picky-Notes,derektliu/Picky-Notes,derektliu/Picky-Notes,folksy-squid/Picky-Notes,derektliu/Picky-Notes,folksy-squid/Picky-Notes,folksy-squid/Picky-Notes,inspiredtolive/Picky-Notes,inspiredtolive/Picky-Notes