Correction of Shopify product cards

Hello everyone.

Requirements:

1. Fix as many errors as possible in the shopping feed (Simprosys app), examples of errors are in the attached file. There is also another common error, which is invalid value gtin, meaning that either the barcode is empty or filled incorrectly. For such products, you need to generate barcodes and fill them in. I cannot say exactly how many products have errors, but overall we have 570, and roughly 20% of them are affected.
2. Fill in the missing information in Walmart through import into Cedcommerce, for example, we looked at toothpaste and some ingredients were missing.
3. Use the search on our website to understand if the product is available for mass market (not B2B) and for product information if needed (only for Walmart) in Simprosys everything is fine.