Refactoring Improving the Design of Existing Code Martin Fowler

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Refactoringisaboutimprovingthedesignofexistingcode.Itistheprocessofchangingasoftwaresysteminsuchawaythatitdoesnotaltertheexternalbehaviorofthecode,yetimprovesitsinternalstructure.Withrefactoringyoucaneventakeabaddesignandreworkitintoagoodone.This