input: Write a function to find and print duplicate words in a sentence.
  assert find_duplicates("I am going to the store to buy food") == ["to"]
  assert find_duplicates("hello hello world") == ["hello"]
  assert find_duplicates("no duplicates here") == []
output: def find_duplicates(sentence):
      words = sentence.split()
      word_count = {}
      duplicates = []
  
      for word in words:
          word_count[word] = word_count.get(word, 0) + 1
  
      for word, count in word_count.items():
          if count > 1:
              duplicates.append(word)
  
      return duplicates