module Substrings {
    void run(String[] args = []) {
        String s = args.size > 0 ? args[0] : "hello";
        @Inject Console console;
        console.print(
            $|Original    : { s                                 .quoted()=}
             |Remove first: { s.substring(1)                    .quoted()=}
             |Remove first: {(s.size < 1 ? "" : s[1..<s.size  ]).quoted()=}
             |Remove last : {(s.size < 1 ? "" : s[0..<s.size-1]).quoted()=}
             |Remove both : {(s.size < 2 ? "" : s[1..<s.size-1]).quoted()=}
        );
    }
}