input: Write a python function to generate new tokens and update a given code base accordingly.
  assert code_generator("def foo(): \n    x = [test]\n    y = [test2]\n    \n    return x + y") == "def foo(): \n    x = <generated-token>\n    y = <generated-token>\n    \n    return x + y"
  assert code_generator("def bar(): \n    a = [token]\n    b = [token2]\n    \n    return a + b") == "def bar(): \n    a = <generated-token>\n    b = <generated-token>\n    \n    return a + b"
  assert code_generator("def baz(): \n    x = [item1]\n    y = [item2]\n    \n    return x * y") == "def baz(): \n    x = <generated-token>\n    y = <generated-token>\n    \n    return x * y"
output: def code_generator(code):
      import re
      
      # Regular expression to find occurrences of [something]
      pattern = re.compile(r'\[[^\]]*\]')
      
      # Replace matches with <generated-token>
      new_code = pattern.sub('<generated-token>', code)
      
      return new_code