input: from typing import List
  
  def generate_string(string_length: int) -> str:
      """Generate a random string of a given length.
      >>> generate_string(10)
      'abcde12345'
      >>> generate_string(5)
      'aBc12'
      """
      import random
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string
output:     import random
      random_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
      random_string = ''.join(random.choices(random_characters, k=string_length))
      return random_string