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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 split(node, stack):
 """Carry over the state from the primal to the adjoint. Args: node: A module with the primal and adjoint function definitions as returned by `reverse_ad`. stack: The stack node to use for storing and restoring state. Returns: func: A `Module` node with two function definitions containing the primal and adjoint respectively. """

  node, defined, reaching = _fix(node)

  # Store and restore the state
  node = store_state(node, reaching, defined, stack)

  # Clean up
  anno.clearanno(node)
  return node