input: Write a python function to find the longest word in a list of words.
  assert find_longest_word(["apple", "banana", "cherry", "date"]) == "banana"
  assert find_longest_word(["python", "java", "c", "javascript"]) == "javascript"
  assert find_longest_word(["cat", "dog", "elephant"]) == "elephant"
output: def find_longest_word(words):
      longest_word = max(words, key=len)
      return longest_word