Improve code on f-strings and brevity (#6126)

* Update strassen_matrix_multiplication.py

* Update matrix_operation.py

* Update enigma_machine2.py

* Update enigma_machine.py

* Update enigma_machine2.py

* Update rod_cutting.py

* Update external_sort.py

* Update sol1.py

* Update hill_cipher.py

* Update prime_numbers.py

* Update integration_by_simpson_approx.py

hashes/enigma_machine.py

@@ -55,5 +55,5 @@ if __name__ == "__main__":
     print("\n" + "".join(code))
     print(
         f"\nYour Token is {token} please write it down.\nIf you want to decode "
-        f"this message again you should input same digits as token!"
+        "this message again you should input same digits as token!"
     )