code: def prefix_struct(s, prefix):
      return hl.struct(**{prefix + k: s[k] for k in s})
  
imports: from typing import Callable, TypeVar
  from typing_extensions import ParamSpec
  import os
  from timeit import default_timer
  import unittest
  import pytest
  from hailtop.hail_decorator import decorator
  from hail.utils.java import choose_backend
  import hail
label_desc: Use image node_id 10 for calling a global function with example usage: prefix_struct(s, prefix) and returns: hl