a nice book

Book.rb

class Book
  attr_reader :title
  
  def initialize()
    @title = ""
    @not_cap = ["a", "and", "an", "the", "in"]
  end
  
  def title=(str)
    word_array = []
    first = true
    str.split.each do |word|
      if @not_cap.include?(word) && first == false
        word_array << word  
      else
        word_array << (word[0].upcase + word[1,word.length])
      end
      first = false
    end
    @title = word_array.join(" ")
  end
end