Fix typos and prevent shooting error

[MHoseinJ]

i fixed following things

• changed bltime to blitme in class Ship
• avoiding error if a bullet shooted while there is no screen

no new features added or removed

[MatinAfzal]

i fixed following things

• changed bltime to blitme in class Ship
• avoiding error if a bullet shooted while there is no screen

no new features added or removed

Hi Mohammad Hossein,
Thanks for the changes you made.
As you can see, there’s a very small conflict in src/game_functions.py that needs to be resolved before merging.
I usually resolve these conflicts myself, but right now Im really busy and can’t.
It would be great if you could fix it and test it so I can merge it.
Good luck.