import pandas as pd

def prepare_csv_data():
    """
    Function to process the CSV data for easier lookup.
    This is not used in the main app, but shows how the CSV data would be processed.
    """
    import requests
    import io
    
    # Download the CSV
    response = requests.get("https://hebbkx1anhila5yf.public.blob.vercel-storage.com/crop_diseases_treatments-DF4R6CPNHW63YU8EkBgGg0uw1lvwq5.csv")
    df = pd.read_csv(io.StringIO(response.text))
    
    # Process the data
    df["Crop_lower"] = df["Crop"].str.lower()
    df["Disease_lower"] = df["Disease"].str.lower()
    
    # Save processed data
    df.to_csv("processed_treatments.csv", index=False)
    
    return df