Fixes the location in memory of the address between nftInfo_t & tokenDefinition_t

Both used as members of the same union, also unifies the type (array of uint8_t)

src/nft.h

@@ -1,14 +1,8 @@
 #include "tokens.h"
 
-// An `nftInfo_t` must be the same size as a `tokenDefinition_t`. This is because both will be held
-// in a `extraInfo_t` which is a union of a `nftInfo_t` and a `tokenDefinition_t`. By having both
-// struct the same size, we know they will be aligned, which facilitates accessing the items.
-
-// We defined the collection name max length to be the size of a `tokenDefinition_t` and remove the
-// `ADDRESS_LENGTH` which corresponds to `sizeof(contractAddress`).
-#define COLLECTION_NAME_MAX_LEN (sizeof(tokenDefinition_t) - ADDRESS_LENGTH)
+#define COLLECTION_NAME_MAX_LEN 70
 
 typedef struct nftInfo_t {
-    char collectionName[COLLECTION_NAME_MAX_LEN];
-    char contractAddress[ADDRESS_LENGTH];
-} nftInfo_t;
+    uint8_t contractAddress[ADDRESS_LENGTH];  // must be first item
+    char collectionName[COLLECTION_NAME_MAX_LEN + 1];
+} nftInfo_t;