move_3.rb

def move(state)
  head = state[:you][:body][0]
  neck = state[:you][:body][1]
  moves = ['up', 'down', 'left', 'right']

  moves.each do |move|
    coord = move_as_coord(move, head)
    if !off_board(state, coord) && !coord_equal(coord, neck)
      return { move: move }
    end
  end
  { move: 'up' }
end