Tadeusz mkp05

## flatmap_optionals.java
// Ways to transform List<Optional<T>> to List<T> (excluding empty ones)

// 1. Using filter()
List<String> filteredList = listOfOptionals.stream()
  .filter(Optional::isPresent)
  .map(Optional::get)
  .collect(Collectors.toList());

// 2. Using flatMap()
List<String> filteredList = listOfOptionals.stream()
	// Ways to transform List<Optional<T>> to List<T> (excluding empty ones)

	// 1. Using filter()
	List<String> filteredList = listOfOptionals.stream()
	.filter(Optional::isPresent)
	.map(Optional::get)
	.collect(Collectors.toList());

	// 2. Using flatMap()
	List<String> filteredList = listOfOptionals.stream()