output: #fixed code
                                  @Test
      public void testExcelFormat1() throws IOException {
          String code =
                  "value1,value2,value3,value4\r\na,b,c,d\r\n  x,,,"
                          + "\r\n\r\n\"\"\"hello\"\"\",\"  \"\"world\"\"\",\"abc\ndef\",\r\n";
          String[][] res = {
                  {"value1", "value2", "value3", "value4"},
                  {"a", "b", "c", "d"},
                  {"  x", "", "", ""},
                  {""},
                  {"\"hello\"", "  \"world\"", "abc\ndef", ""}
          };
          CSVParser parser = new CSVParser(code, CSVFormat.EXCEL);
          List<CSVRecord> records = parser.getRecords();
          assertEquals(res.length, records.size());
          assertTrue(records.size() > 0);
          for (int i = 0; i < res.length; i++) {
              assertTrue(Arrays.equals(res[i], records.get(i).values()));
          }
      }
input: #vulnerable code 
                                  @Test
      public void testExcelFormat1() throws IOException {
          String code =
                  "value1,value2,value3,value4\r\na,b,c,d\r\n  x,,,"
                          + "\r\n\r\n\"\"\"hello\"\"\",\"  \"\"world\"\"\",\"abc\ndef\",\r\n";
          String[][] res = {
                  {"value1", "value2", "value3", "value4"},
                  {"a", "b", "c", "d"},
                  {"  x", "", "", ""},
                  {""},
                  {"\"hello\"", "  \"world\"", "abc\ndef", ""}
          };
          CSVParser parser = new CSVParser(code, CSVFormat.EXCEL);
          String[][] tmp = parser.getRecords();
          assertEquals(res.length, tmp.length);
          assertTrue(tmp.length > 0);
          for (int i = 0; i < res.length; i++) {
              assertTrue(Arrays.equals(res[i], tmp[i]));
          }
      } 
                              #location 15 
                              #vulnerability type NULL_DEREFERENCE