input: Write a python function to find the longest word in an array of strings.
  assert find_longest_word(["Hello", "World", "Python", "Programming"]) == "Programming"
  assert find_longest_word(["Short", "Longer", "Longest"]) == "Longest"
  assert find_longest_word(["One", "Three", "Fourteen"]) == "Fourteen"
output: def find_longest_word(words):
      longest_word = ""
      for word in words:
          if len(word) > len(longest_word):
              longest_word = word
      return longest_word