Update lib/read_pdf.py

lib/read_pdf.py

@@ -1,6 +1,6 @@
 import pdfplumber
 import re
-
+import os
 # Extract text as paragraph delimiter without tables and graphs
 def extract_and_format_paragraphs(pdf_path):
     """Extract and format paragraphs from a PDF text, applying filters to remove headers, footnotes, and specific sections."""