Fix compilation warnings

[carlospatinos]

There are 46 warnings
As in here:
required: UpdateAction
found: UpdateAction
46 warnings

Run ./gradlew build to see all of them

Fix all of them and make sure the project still compiles and pass all CI cycles

[carlospatinos]

Can this be considered for hacktoberfest?

[ahmetoz]

Hey @carlospatinos yes, if you are willing to fix the compile time warnings we will be appreciated, thanks 👍🏽