def fstring_to_string(node: Node) -> Leaf:
    """Converts an fstring node back to a string node."""
    string_without_prefix = str(node)[len(node.prefix) :]
    string_leaf = Leaf(token.STRING, string_without_prefix, prefix=node.prefix)
    string_leaf.lineno = node.get_lineno() or 0
    return string_leaf
Converts an fstring node back to a string node.
src/black/nodes.py