fixed miss type in the code

Author: Marks Mac

financial/amortization_table.py

@@ -79,7 +79,7 @@ def amortization_table(
     payments = years * 12
     interest_rate /= 12
     payment_amount = payment(principal, interest_rate, payments)
-    df = pd.DataFrame(index=range(0, payments + 1), columns=["Payment", "Principal", "Interest", "Remaining"], dtype="float", data=0)
+    amor_table = pd.DataFrame(index=range(0, payments + 1), columns=["Payment", "Principal", "Interest", "Remaining"], dtype="float", data=0)
 
     amor_table["Payment"][1:] = payment_amount
     amor_table["Remaining"][0] = principal