Change folder name

datapuller.py

@@ -2,7 +2,7 @@ import yfinance as yf
 import pandas as pd
 
 # Import the S&P 500 symbols
-symbols = pd.read_excel("./Data/stock_symbols.xlsx")
+symbols = pd.read_excel("./data/stock_symbols.xlsx")
 symbols.columns = symbols.columns.str.strip()
 tickers = symbols['Symbol'].tolist()
 
@@ -45,5 +45,5 @@ final_df = pd.concat(all_data)
 final_df.dropna(inplace=True)
 
 print("Writing data to file")
-final_df.to_parquet("./Data/stocks.parquet")
-final_df.head(200).to_csv("./Data/stocks_preview.csv")
+final_df.to_parquet("./data/stocks.parquet")
+final_df.head(200).to_csv("./data/stocks_preview.csv")