input: Write a python function to perform sentiment analysis using the provided token-based scoring method.
  assert sentiment_analysis("I love sunny days") > 0
  assert sentiment_analysis("I hate rainy days") < 0
  assert sentiment_analysis("This is a neutral statement") == 0
output: def sentiment_analysis(text):
      positive_words = {"love", "happy", "sunny", "good", "great", "fantastic"}
      negative_words = {"hate", "sad", "rainy", "bad", "terrible", "awful"}
      
      words = text.lower().split()
      score = 0
      
      for word in words:
          if word in positive_words:
              score += 1
          elif word in negative_words:
              score -= 1
      
      return score