input: Write a python function to create and start an HTTP server on a specified port.
  assert create_and_start_server(8080) is None  # This should start the server on port 8080
  assert create_and_start_server(9090) is None  # This should start the server on port 9090
output: def create_and_start_server(port):
      from http.server import HTTPServer, SimpleHTTPRequestHandler
      
      server_address = ('', port)
      httpd = HTTPServer(server_address, SimpleHTTPRequestHandler)
      
      print(f"Starting server on port {port}")
      httpd.serve_forever()