def get_lvalue_lead(lvalue_node):
  """return '&' or '*' of lvalue if available"""
  if lvalue_node.__class__.__name__ == 'UnaryOp' and lvalue_node.op == '&':
    return '&'
  elif lvalue_node.__class__.__name__ == 'UnaryOp' and lvalue_node.op == '*':
    return '*'
  return None