remove_action() hook not working

Actions (and filters) can be removed only after they had been set, therefor you will have to figure out when in the execution path the woocommerce_template_single_excerpt is being added, and remove it only after that.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)