input: Write a python function to create a directory with a given name.
  assert create_directory("test_dir") == True
  assert os.path.exists("test_dir") == True
  assert create_directory("") == False
output: import os
  
  def create_directory(directory_name):
      if not directory_name:
          return False
      try:
          os.makedirs(directory_name, exist_ok=True)
          return True
      except Exception:
          return False