get_template_part based upon post’s category

It looks like the single quotes are giving you problems.

Replace:

get_template_part( 'templates', '$childcat->slug' );

with:

get_template_part( 'templates', $childcat->slug );

Note that double quoted strings in PHP can parse variables, not single quotes.

Also check out the curly syntax in the PHP docs in the variable parsing section.

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