<commit_before>class Grains

  def square(number)
    2**(number-1)
  end

  def total
    sum = 0
    (1..64).each do |number|
      sum += square(number)
    end
    sum
  end

end<commit_msg>Refactor grains<commit_after>class Grains

  def square(number)
    2**(number-1)
  end

  def total
    (1..64).inject(0) do |sum, number|
      sum + square(number)
    end
  end

end
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