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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 _find_statement_by_line(node, line):
 """Extracts the statement on a specific line from an AST. If the line number of node matches line, it will be returned; otherwise its children are iterated and the function is called recursively. :param node: An astroid node. :type node: astroid.bases.NodeNG :param line: The line number of the statement to extract. :type line: int :returns: The statement on the line, or None if no statement for the line can be found. :rtype: astroid.bases.NodeNG or None """

    if isinstance(node, (nodes.ClassDef, nodes.FunctionDef)):
        # This is an inaccuracy in the AST: the nodes that can be
        # decorated do not carry explicit information on which line
        # the actual definition (class/def), but .fromline seems to
        # be close enough.
        node_line = node.fromlineno
    else:
        node_line = node.lineno

    if node_line == line:
        return node

    for child in node.get_children():
        result = _find_statement_by_line(child, line)
        if result:
            return result

    return None