input: Write a python function to get the full name from first and last names.
  assert get_full_name("John", "Smith") == "John Smith"
  assert get_full_name("Jane", "Doe") == "Jane Doe"
  assert get_full_name("Alice", "Johnson") == "Alice Johnson"
output: def get_full_name(first_name, last_name):
      return f"{first_name} {last_name}"