public void appendOptional(final @NonNull CommandComponent<?> argument) {
            this.builder.append(this.optionalPrefix());
            this.appendName(argument.name());
            this.builder.append(this.optionalSuffix());
        }
Append an optional argument

@param argument Optional argument
cloud-core/src/main/java/org/incendo/cloud/syntax/StandardCommandSyntaxFormatter.java