Update syntax highlighting, update allUnique

snippets/byte_size.md

@@ -6,12 +6,12 @@ Returns the length of a string in bytes.
 
 `utf-8` encodes a given string, then `len` finds the length of the encoded string.
 
-```python
+```py
 def byte_size(string):
     return(len(string.encode('utf-8')))
 ```
 
-```python
+```py
 byte_size('😀') # 4
 byte_size('Hello World') # 11
 ```