def sentence
      string    = word_count.times.map { word }.join(' ')
      string[0] = Unicode.upcase(string[0]) unless string.to_s == ''
      string
    end
def sentence
      string    = word_count.times.map { word }.join(' ')
      string[0] = Unicode.upcase(string[0]) unless string.to_s == ''
      string
    end
Generate sentence

 @return [String]