Update README.md

add import and sub_functions

README.md

@@ -76,6 +76,28 @@ The dataset is in Korean (`ko`).
   * 분리된 pdf binary는 병합하여 로컬 경로에 pdf파일로 저장함.
   
 ```
+import os
+from typing import List
+from itertools import groupby
+
+import datasets
+import pandas as pd
+import fitz # pip install PyMuPDF
+
+def merge_pdf_data(pdf_data_list:List[bytes], output_pdf_path:str):
+    """Merge List of pdf binary to pdf files."""
+    output_pdf = fitz.open()
+    
+    for pdf_data in pdf_data_list:
+        pdf_document = fitz.open("pdf", pdf_data)
+        for page_num in range(len(pdf_document)):
+            output_pdf.insert_pdf(pdf_document, from_page=page_num, to_page=page_num)
+    
+    output_pdf.save(output_pdf_path)
+    output_pdf.close()
+    
+    print(f"Merged PDF saved as {output_pdf_path}")
+
 def load_rag_eval_data(target_pdf_dir:str):
     """Load `allganize/RAG-Evaluation-Dataset-KO` dataset