code: def format_title(text):
      
      text = text.strip()
      # if empty string, return ""
      if len(text) == 0:
          return text
      else:
          text = text.lower()  # lower all char
  
          # Change to in single space format
          words = [word for word in text.strip().split(" ") if len(word) >= 1]
  
          # Capitalize all words except function word
          words_new = list()
          for word in words:
              if word not in FUNCTION_WORD:
                  word = word[0].upper() + word[1:]
              words_new.append(word)
  
          # Make sure first word always be capitalized
          words_new[0] = words_new[0][0].upper() + words_new[0][1:]
  
          return " ".join(words_new)
docs: Capitalize first letter for each words except function words.
  
      Example::
  
          title = "Beautiful is Better than Ugly"
  
      **中文文档**
  
      将文本 "标题化", 即除了虚词, 每一个英文单词的第一个字母大写。