code: private String normlizeQuotes( String str ) {
          if( str.length() > 1 && str.charAt( 0 ) == '\'' && str.charAt( str.length() - 1 ) == '\'' ) {
              return '\"' + str.substring( 1, str.length() - 1 ) + '\"';
          }
          return str;
      }
docs: Convert single quotes to double quotes.
  @param str input
  @return normalize string