zcalcu: Chat & Calculator

z is my apps unique name, and calcu is an acronym for chat and lie current user. This app can disguise a chat application into a simple calculator, using a secret code in its calculation that can be arranged.

Its main features:
-Unlock the chat feature by calculate default secret key "17-08-1945".
-Setting the secret key.
-Change app type and icon between calculator and chat.
-Chat a friend by an username with picture, and text.