Update 10.5.5 Contains a Vowel

Unit 10: Strings/10.5 The in Keyword/10.5.5 Contains a Vowel

@@ -1,8 +1,6 @@
 # use `in` to determine if `word` contains any vowels!
 def contains_vowel(word):
-    vowels = ["a", "e", "i", "o", "u"]
-    for i in vowels:
-        for letter in word:
-            if letter == i:
-                return True
-    return False
+    if("a" in word or "e" in word or "i" in word or "o" in word or "u" in word):
+        return True
+    else:
+        return False