input: Write a python function to remove a specific word from a sentence.
  assert remove_word('I love Python programming', 'Python') == 'I love programming'
  assert remove_word('The quick brown fox jumps over the lazy dog', 'brown') == 'The quick fox jumps over the lazy dog'
  assert remove_word('Python is fun', 'fun') == 'Python is'
output: def remove_word(sentence, word):
      return ' '.join([w for w in sentence.split() if w != word])