input: 
  import random
  
  def generate_string(string_length: int) -> str:
      """Generates a random string of the specified length from a set of characters.
      >>> generate_string(10)
      'aB3dFgHjK2'
      >>> generate_string(5)
      'XyZ12'
      """
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string
  
output:     random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string