Right code:
$pulizia_esc = get_the_author_meta( 'pulizia_esc', $post->post_author ) . ' ' . get_post_meta( $post->ID, "function_pulizia", true ) ;
if ( ! empty( $pulizia_esc)) {
$pulizia_esc="<div class="pulizia_esc">". $pulizia_esc . ' euro' .'</div>';
}
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