update_parent_class_from_node

Description:

protected string? update_parent_class_from_node (string node_type_lower, Node node, string code_content, string? parent_class_name)

Update parent class string if node is a class/struct/interface declaration.

node_type_lower	Lowercase node type string
node	AST node
code_content	Source code content for text extraction
parent_class_name	Current parent class string (may be null)

Updated parent class string, or parent_class_name if node is not a class/struct/interface