input: Write a function to take in a list of phrases and generate a string with each phrase followed by its length. The function should return the resulting string. If the input list is empty, the function should return an empty string.
  
  assert generate_length_string(["A bird in the hand", "is worth two in the bush"]) == "A bird in the hand (17)is worth two in the bush (25)"
  assert generate_length_string([]) == ""
output: def generate_length_string(phrases):
      if not phrases:
          return ""
      result = ""
      for phrase in phrases:
          result += f"{phrase} ({len(phrase)})"
      return result