private static String stripQuotes(final String quotedString) {
        return quotedString.substring(1, quotedString.length() - 1);
    }
Remove single/double quotes around String literal

@param quotedString : quoted string
@return quotes stripped string
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/language/grammar/GenericLiteralVisitor.java