This is Refactoring / code cleanup. See: * https://refactoring.com/catalog/extractMethod.html * https://en.wikipedia.org/wiki/Code_refactoring * https://www.refactoring.com/ * https://www.joelonsoftware.com/2002/01/23/rub-a-dub-dub/ Some small optimisations may have slipped in as well.
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