Micro-optimization: avoid creating unnecessary objects

[kevingamez]

In _requestBalances function in appstate_container.dart file, in requestUpdate function in appstate_container.dart file, keys in requestUpdate function in appstate_container.dart file and in queueContainsRequestWithHash function in account_service.dart file unnecessary objects are created.

There are objects that are created within the routes where a new element is instantiated each time an iteration is made in the code. The correction is simple, you have to create the objects outside the loop. For example, in the image the String combinedBalance could be initialize before the loops. It can be initialize with an empty value, as “”.