Updated a typo in print statement (TheAlgorithms#7696)

* Updated a typo in print statement

* Apply suggestions from code review

Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

Co-authored-by: Christian Clauss <cclauss@me.com>
Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>

Author: 3 people

strings/barcode_validator.py

@@ -83,6 +83,6 @@ def get_barcode(barcode: str) -> int:
     barcode = get_barcode(input("Barcode: ").strip())
 
     if is_valid(barcode):
-        print(f"'{barcode}' is a valid Barcode")
+        print(f"'{barcode}' is a valid barcode.")
     else:
-        print(f"'{barcode}' is NOT is valid Barcode.")
+        print(f"'{barcode}' is NOT a valid barcode.")