input: 
  def analyze_sentiment(text: str) -> str:
      """Analyzes the sentiment of the given text and categorizes it into positive, negative, or neutral sentiment.
      >>> analyze_sentiment("I feel really great today!")
      'positive'
      >>> analyze_sentiment("This is not a good day.")
      'negative'
      >>> analyze_sentiment("There is some news to share.")
      'neutral'
      """
  
output:     positive_words = ["great", "happy", "wonderful", "good"]
      negative_words = ["bad", "terrible", "not good", "sad"]
      
      text = text.lower()
      
      for word in positive_words:
          if word in text:
              return 'positive'
      
      for word in negative_words:
          if word in text:
              return 'negative'
      
      return 'neutral'