Update kebab.md

Resolves #212

snippets/kebab.md

@@ -11,11 +11,10 @@ Break the string into words and combine them adding `-` as a separator, using a
 from re import sub
 
 def kebab(s):
-  return sub(
-    r"(\s|_|-)+","-",
-    sub(
-      r"[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+",
-      lambda mo: mo.group(0).lower(), s))
+  return '-'.join(
+    sub(r"(\s|_|-)+"," ",
+    sub(r"[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+",
+    lambda mo: ' ' + mo.group(0).lower(), s)).split())
 ```
 
 ```py