code: public MoneyFormatterBuilder appendLiteral(CharSequence literal) {
          if (literal == null || literal.length() == 0) {
              return this;
          }
          LiteralPrinterParser pp = new LiteralPrinterParser(literal.toString());
          return appendInternal(pp, pp);
      }
docs: Appends a literal to the builder.
  <p>
  The localized currency symbol is the symbol as chosen by the locale
  of the formatter.
  
  @param literal  the literal to append, null or empty ignored
  @return this, for chaining, never null