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// ... type Package struct { ID string json:"id" DateOfManufacture string json:"dateOfManufacture" // ISO 8601 date format PlaceOfOrigin string json:"placeOfOrigin" // "City, Country" CurrentStatus string json:"currentStatus" CustomsDetails []string json:"customsDetails" IsDamaged bool json:"isDamaged" } type NFT struct { ID string json:"id" Owner string json:"owner" Category string json:"category" // "Antibiotic", "Painkiller", etc. } func (c *Contract) CreatePackage(ctx contractapi.TransactionContextInterface, id string, dateOfManufacture string, placeOfOrigin string) error { // Ensure dateOfManufacture is in ISO 8601 format. Validations can be added here. // Ensure placeOfOrigin is in the format "City, Country". Validations can be added here. package := Package{ ID: id, DateOfManufacture: dateOfManufacture, PlaceOfOrigin: placeOfOrigin, CurrentStatus: "CREATED", CustomsDetails: []string{}, IsDamaged: false, } packageBytes, _ := json.Marshal(package) return ctx.GetStub().PutState(id, packageBytes) } // ... other functions ... func (c *Contract) MintNFT(ctx contractapi.TransactionContextInterface, id, owner, category string) error { // Validate category if needed, e.g., ensure it matches known categories for pharmaceuticals. nft := NFT{ ID: id, Owner: owner, Category: category, } nftBytes, _ := json.Marshal(nft) return ctx.GetStub().PutState(id, nftBytes) } // ... rest of the functions ...