Chain of responsibility

• https://www.journaldev.com/1617/chain-of-responsibility-design-pattern-in-java

• https://github.com/grzesiek-galezowski/fizz-buzz-java

• https://refactoring.guru/design-patterns/chain-of-responsibility/java/example

• http://www.baeldung.com/chain-of-responsibility-pattern

• https://codurance.com/2015/04/16/design-patterns-in-the-21st-century-part-four/