The right way to abstract
Start by implementing the problem in the concrete, not in the abstract. Don't try to guess what interfaces you will need. Discover them.
Only after implementing the problem in the concrete, go on to decoupling. Ask yourself: "What do I need to decouple to make it better, to allow it to deal with change as the data or business changes?".
Leaving the code in the concrete is also an option. Don't force abstractions when they are not necessary. Prefer duplication over the wrong abstraction because duplication is cheaper to deal with.
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