Design cursor$-$right

You will now complete the first item of the wish$-$list $-$ the cursor$-$right function. The function should take an Editor and return an Editor with the cursor moved once to the right, unless it is already at the right end of the text. Remember how functions were called by others in the drag$-$and$-$drop diagram you just completed, and think about whether you should design any functions to be called by cursor$-$right.

Be sure to carefully follow the design recipes $--$ defining examples will really help. Writing good examples of the functions you design is key to making them easier to design.