docs: public static void splitPdf(File inputPdfFile, File outputPdfFile, int firstPage, int lastPage) {
          if (PDFBOX.equals(System.getProperty(PDF_LIBRARY))) {
              PdfBoxUtilities.splitPdf(inputPdfFile, outputPdfFile, firstPage, lastPage);
          } else {
              try {
                  PdfGsUtilities.splitPdf(inputPdfFile, outputPdfFile, firstPage, lastPage);
              } catch (Exception e) {
                  System.setProperty(PDF_LIBRARY, PDFBOX);
                  splitPdf(inputPdfFile, outputPdfFile, firstPage, lastPage);
              }
          }
      }