fix#15 issue

Author: Abhi Suryawanshi

app/etl/extract.py

@@ -72,7 +72,7 @@ def extract(path: str = "xyz.csv") -> pd.DataFrame:
             raise ValueError("❌ Failed to read data from file")
 
         if df.empty:
-            raise ValueError("❌ File contains no data")
+            raise ValueError(" File contains no data")
 
         print(f"✅ Extracted {len(df)} rows and {len(df.columns)} columns")  # TODO: Use logging instead of print
         return df