a lot of fixes, implementing abstract product api endpoints

src/utils/hash.js

@@ -0,0 +1,11 @@
+import { createHash } from 'node:crypto'
+
+const hashAbstractProduct = (barcode, name, net_weight, image_filename, category, unit) =>  {
+    return createHash('md5').update(`${barcode}${name}${net_weight}${image_filename}${category}${unit}`).digest('hex');
+}
+
+const hashProduct = (abstract_product_id, amount, date_of_production, expiry_date) => {
+    return createHash('md5').update(`${abstract_product_id}${amount}${date_of_production}${expiry_date}`).digest('hex');
+}
+
+export default { hashAbstractProduct, hashProduct };