Double Jumping Refactoring

[JMetalian]

Describe the feature you'd like The jumping function adds up an additional jump if it is pressed on air and performs the jump after landing. A suggestion for that to check with an additional control statement and not put an additional jumping after landing.

Is your feature request related to a problem? Please describe. It is not a problem but definitely a feasible behavior for user experience.

How To Observe The Additional Jump? Jump once and while on air, press on jumping button again. After landing, it will perform another jump.