Allow spending to contract addresses

src/hz.erl

@@ -1708,7 +1708,7 @@ spend(SenderID,
       Nonce,
       Payload,
       NetworkID) ->
-    case decode_account_id(unicode:characters_to_binary(SenderID)) of
+    case gmser_api_encoder:safe_decode(account_pubkey, unicode:characters_to_binary(SenderID)) of
         {ok, DSenderID} ->
             spend2(gmser_id:create(account, DSenderID),
                    SecKey,
@@ -1752,11 +1752,10 @@ spend2(DSenderID,
 
 
 decode_account_id(B) ->
-    try
-        {account_pubkey, PK}  = gmser_api_encoder:decode(B),
-        {ok, PK}
-    catch
-        E:R -> {E, R}
+    case gmser_api_encoder:safe_decode(account_pubkey, B) of
+        {ok, PK}                -> {ok, PK};
+        {error, invalid_prefix} -> gmser_api_encoder:safe_decode(contract_pubkey, B);
+        Error                   -> Error
     end.