input: import random
  
  def generate_string(string_length: int) -> str:
      """ Generate a random string of a specified length.
      >>> generate_string(10)
      'aB3XzY7Rt9' # Example output
      """
output:     characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
      return ''.join(random.choice(characters) for _ in range(string_length))