main.b: merge refactoring (rebased)

all_diffs

src/Screenshot 2025-01-23 212353.jpg

src/application/Application_C2.java

src/application/Application_C4.java

src/application/Application_E12.java

src/application/package-info.java

src/components/Calculator.java

src/components/Components.java

src/components/DataFactory.java

src/components/Formatter.java

src/components/Printer.java

src/components/Validator.java

src/components/impl/CalculatorImpl.java

src/components/impl/ComponentsImpl.java

src/components/impl/DataFactoryImpl.java

src/components/impl/FormatterImpl.java

src/components/impl/OrderBuilderImpl.java

src/components/impl/PrinterImpl.java

src/datamodel/Article.java

src/datamodel/Customer.java