What one must do, one must do properly.

What must be done, must be done properly

It must be done, must be done properly

It must be done properly what one must do

One must do properly what has to be done

All Of The Above Are Correct

Active Voice: What one must do.

Passive Voice: What must be done.

Active Voice: One must do properly.

Passive Voice: Must be done properly.

Note:- Before and after comma, both sentences must be changed into passive voice