input: Write a python function to create a list of employee names from a list of Employee objects.
  assert employee_names([Employee(1, 'Alice'), Employee(2, 'Bob'), Employee(3, 'Charlie')]) == ['Alice', 'Bob', 'Charlie']
  assert employee_names([Employee(4, 'David'), Employee(5, 'Eva')]) == ['David', 'Eva']
  assert employee_names([]) == []
output: def employee_names(employees):
      return [employee.name for employee in employees]