class RuboCop::Cop::Layout::SpaceInsideStringInterpolation

def each_style_violation(node)
  node.each_child_node(:begin) do |begin_node|
    final_node = begin_node.children.last
    next unless final_node
    if style == :no_space && space_on_any_side?(final_node)
      yield final_node
    elsif style == :space && !space_on_each_side?(final_node)
      yield final_node
    end
  end
end