test(clean_the_list): fix wrong test output

sh/tests/student/shopping.py

@@ -0,0 +1,9 @@
+def clean_list(shopping_list):
+    if shopping_list:
+        cleaned_list = ([f"{index + 1}/ {item.strip().capitalize()}" 
+                        for index, item in enumerate(shopping_list)])
+        if "Milk" not in shopping_list:
+            cleaned_list.append(f"{len(cleaned_list)}/ Milk")
+        return cleaned_list
+    else:
+        return []