empty json file issue

[Azinh99]

I have 4txt files to make their kg, I wrote sanitize def to delete any citation between sentences and default neo4j prompt; but it makes empty json and in raw_response.txt it shows only context not json format! I used these two:

def sanitize_chunk(chunk):
    """Remove citations, years, and escape problematic characters."""
    chunk = re.sub(r'\[\d+\]', '', chunk)      # remove [1], [2], ...
    chunk = re.sub(r'\(\d{4}\)', '', chunk)    # remove (2001), (1999), ...
    chunk = chunk.replace('"', "'")            # replace quotes
    chunk = re.sub(r"\s+", " ", chunk).strip()
    return chunk

kg_prompt = (
        "You are a strict information extraction system.\n"
        "Return ONLY valid JSON in EXACTLY this format:\n"
        '{"nodes": [{"name": "<entity>", "label": "<type>"}], '
        '"relationships": [{"start_node": {"name": "<entity1>"}, '
        '"end_node": {"name": "<entity2>"}, "type": "<relation>"}]}\n'
        "If nothing found, return {\"nodes\": [], \"relationships\": []}.\n"
        "Do NOT include any explanation, citation, or other text.\n\n"
        f"Text:\n'''{rephrased}'''\n"

Many thanks for your response