The insideds of a function is separated from the global things. Therefore the variables, set by other processes are not reachable/useable inside a function until you made them so, with, for example global keyword for a var.
So
Add
the_post();
after the function’s {,
or add
global $post;
and use $post->ID instead of the_ID and so on.
I also recommend you to read some books on programming PHP.
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