Im having a problem making a preview method with Ruby. instead of just preview the content it shows all of the content

class Note

  attr_accessor :content, :notes
  @content
  @notes

  def initialize(content)
    @content = content
    @notes = []
  end

  def add_note(content)
    notes.push(content) 
  end

  def print_notes(kind = 'full lists')

    puts "#{content}" 
    puts "-" * 30 
     puts @notes  
  end  

  def preview
     if notes.length < 25
      puts "Preview of notes:"
      puts "-" * 30
      notes.each do |notes|
      if
      puts notes.slice(0..29) + ' (...)'
      end
      end    
      end
  end
end



note = Note.new("my notes")
note.add_note("I have to take my son to his appointment for a check up")
note.add_note("I have to go to the bank to take out a loan")
note.add_note("I have to go get my car inspected")

puts note.preview