Show how to use format xtd::format class with null pointers.
#include <xtd/xtd>
auto main() -> int {
console::out << format("{}", null) << environment::new_line;
console::out << format("{}", null_ptr {}) << environment::new_line;
console::out << format("{}", nullptr) << environment::new_line;
console::out << format("{}", std::nullptr_t {}) << environment::new_line;
console::out << format("{}", NULL) << environment::new_line;
console::out << format("{}", 0) << environment::new_line;
}