input: Write a function to list the contents of a directory. The function should take no parameters and return the list of file and directory names as a list of strings.
  
  import os
  
  def list_directory_contents():
      return os.listdir()
  
  assert list_directory_contents() == ['file1.txt', 'file2.txt', 'directory1']
  assert list_directory_contents() == ['another_file.txt', 'another_directory']
  assert list_directory_contents() == []
output: def list_directory_contents():
      return os.listdir()