‘skroutz’ === $feed_config[‘provider’] is not return True

the bellow function is not working correctly, i have create one skroutz xml file when i checked the code the bellow function is not working (same with the ‘bestprice’)

 function woo_feed_availability_attribute_value_modify( $attribute_value, $product, $feed_config ) {
if ( 'bestprice' === $feed_config['provider'] ) {
if ( 'in stock' === $attribute_value ) {
 return 'Y';
} 
      return 'N';
    }

    if ( 'skroutz' === $feed_config['provider'] ) {
        if ( 'in stock' === $attribute_value ) {
            $in_stock_string = __( 'Delivery 1 to 3 days', 'woo-feed' );
        } else {
            $in_stock_string = __( 'Delivery up to 30 days', 'woo-feed' );
        }
        return $in_stock_string;
    }

    if ( 'pricerunner' === $feed_config['provider'] ) {
        if ( 'in stock' === $attribute_value ) {
            return 'Yes';
        }

        return 'No';
    }

    if ( 'google' === $feed_config['provider'] || 'pinterest' === $feed_config['provider'] ) {
        if ( 'on backorder' === $attribute_value || 'on_backorder' === $attribute_value ) {
            return 'preorder';
        }
        if ( 'google' === $feed_config['provider'] ) {
            if ( ! in_array( $attribute_value, array( 'in_stock', 'out_of_stock', 'on_backorder' ) ) ) {
                return 'in_stock';
            }
        } elseif ( ! in_array( $attribute_value, array( 'in stock', 'out of stock', 'on backorder' ) ) ) {
            return 'in stock';
        }
    }

    if ( 'facebook' === $feed_config['provider'] ) {
        if ( 'on backorder' === $attribute_value ) {
            return 'available for order';
        } elseif ( ! in_array( $attribute_value, array( 'in stock', 'out of stock', 'on backorder' ) ) ) {
            return 'in stock';
        }
    }

    return $attribute_value;
}
}

the line ‘skroutz’ === $feed_config[‘provider’ and ‘bestprice’ === $feed_config[‘provider’] return false, but my file have tyme skroutz and the other bestprice.

why?