When a hang fire or misfire happens immediately eject the cartridge or shell to clear the chamber?

When you pull the trigger and nothing happens you don't know whether you have a misfire (failure to go off) or a hangfire (delayed firing). You should continue to point the muzzle in a safe direction for 30 seconds and then deal with the issue appropriately. Tap the magazine to ensure that it is in place and properly seated, then rack the slide to cycle to the next round. All the while keeping the muzzle pointed in a safe direction and your finger off the trigger until you're ready to fire at your target.