Extract package for handlers
add handler package Signed-off-by: Cheikh Seck <cheikhhseck@gmail.com> add signature Signed-off-by: Cheikh Seck <cheikhhseck@gmail.com> Revert "add signature" This reverts commit ed54c2f91479d55afcfa3336a90a3464a93ef228. refactor main.go to use handler package. Signed-off-by: Cheikh Seck <cheikhhseck@gmail.com> export ClosedConstant from handler package. Signed-off-by: Cheikh Seck <cheikhhseck@gmail.com>