input: def is_palindrome(s: str) -> bool:
      """ Check whether the given string is a palindrome """
      return s == s[::-1]
  
  
  def shortest_palindrome(s: str) -> str:
      """ Generate the shortest palindrome starting with the given string.
      Approach:
      - Identify the longest suffix of the given string that is a palindrome.
      - Append the reverse of the non-palindromic prefix to the end of the string.
      >>> shortest_palindrome('')
      ''
      >>> shortest_palindrome('dog')
      'dogod'
      >>> shortest_palindrome('dogo')
      'dogod'
      """
output:     def shortest_palindrome(s: str) -> str:
      if is_palindrome(s):
          return s
      for i in range(len(s)):
          if is_palindrome(s[i:]):
              return s + s[:i][::-1]
      return s # Fallback in case the loop doesn't return anything, although it should not happen.
  
  # Test cases
  if __name__ == "__main__":
      import doctest
      doctest.testmod()