docs: public static String fwsTohws( String str )
      {
          char[] chars = str.toCharArray();
          for ( int j = 0; j < chars.length; j++ ) {
              if ( chars[j] == '\u3000' ) {
                  chars[j] = '\u0020';
              } else if ( chars[j] > '\uFF00' 
                  && chars[j] < '\uFF5F' ) {
                  chars[j] = (char)(chars[j] - 65248);
              }       
          }
          
          return new String(chars);
      }