how to remove the contents of vbox?

[Arthur 1989 <arthur19891106 gmail com>]

hello, I got this func: static void (GtkWidget *vbox) {...}, when passed in
an vbox, it should insert a GtkWidget *scrolled_window into the vbox, but I
want to clear the contents of vbox first,otherwise the old contents will be
displayed as well as the newly inserted widget. I am wondering how to
implement this.Any tips will be appreciated.

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Best regards