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It is not necessary to store all Services in the example_interface package. They can be in any package the example_interface is just an example package.
There are a lot of other packages with messages and services defined in them. Just off the top of my head: rcl_interfaces and common_interfaces repositories have several packages with messages and services defined.
If you've changed the name on your package and it's not working I'd suggest posting enough information here to reproduce it so that we can help you make sure you have renamed everything that you need to rename. There's likely something that needed to be renamed that you overlooked.