old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  """basic functions."""
  
  
  def fib(number: int) -> int:
      """
      Simple Fibonacci function.
  
      >>> fib(10)
      55
      """
      if number < 2:
          return number
      else:
          return fib(number-1) + fib(number-2)
  
  
  def hello() -> str:
      """
      Simple Hello World.
  
      >>> hello()
      'Hello World'
      """
      return 'Hello World'
  
  
  def add42(number: int) -> int:
      """
      Add 42 to number.
  
      >>> add42(100)
      142
      """
      return number + 42
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  """basic functions."""
  
  
  def fib(number: int) -> int:
      """
      Simple Fibonacci function.
  
      >>> fib(10)
      55
      """
      if number < 2:
          return number
      return fib(number-1) + fib(number-2)
  
  
  def hello() -> str:
      """
      Simple Hello World.
  
      >>> hello()
      'Hello World'
      """
      return 'Hello World'
  
  
  def add42(number: int) -> int:
      """
      Add 42 to number.
  
      >>> add42(100)
      142
      """
      return number + 42
  
subject: Remove redundant else