input: Write a python function to count the occurrences of each word in a given sentence using the Counter from the collections module.
  assert word_count("Python is a great programming language") == {'Python': 1, 'is': 1, 'a': 1, 'great': 1, 'programming': 1, 'language': 1}
  assert word_count("hello world hello") == {'hello': 2, 'world': 1}
  assert word_count("test test test") == {'test': 3}
output: from collections import Counter
  
  def word_count(sentence):
      words = sentence.split()
      return dict(Counter(words))