Leaf search in forrest III

While Kara is not on a leaf, he tests whether he can step ahead or turn left or turn right, and takes the appropriate action.

while not kara.onLeaf
  if not kara.treeLeft
    kara.turnLeft
    kara.move
  else
    if not kara.treeFront
      kara.move
    else
      if not kara.treeRight
        kara.turnRight
        kara.move
      end
    end
  end
end

kara.removeLeaf