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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def thunk(coro):
 """ A thunk is a subroutine that is created, often automatically, to assist a call to another subroutine. Creates a thunk coroutine which returns coroutine function that accepts no arguments and when invoked it schedules the wrapper coroutine and returns the final result. See Wikipedia page for more information about Thunk subroutines: https://en.wikipedia.org/wiki/Thunk Arguments: value (coroutinefunction):
 wrapped coroutine function to invoke. Returns: coroutinefunction Usage:: async def task():
 return 'foo' coro = paco.thunk(task) await coro() # => 'foo' await coro() # => 'foo' """

    assert_corofunction(coro=coro)

    @asyncio.coroutine
    def wrapper():
        return (yield from coro())

    return wrapper