move slash_join to prevent local imports

util/__init__.py

@@ -1,3 +1,18 @@
 def get_app_url(config):
   """ Returns the application's URL, based on the given config. """
   return '%s://%s' % (config['PREFERRED_URL_SCHEME'], config['SERVER_HOSTNAME'])
+
+
+def slash_join(*args):
+  """
+  Joins together strings and guarantees there is only one '/' in between the
+  each string joined. Double slashes ('//') are assumed to be intentional and
+  are not deduplicated.
+  """
+  def rmslash(path):
+    path = path[1:] if path[0] == '/' else path
+    path = path[:-1] if path[-1] == '/' else path
+    return path
+
+  args = [rmslash(path) for path in args]
+  return '/'.join(args)

util/config/oauth.py

@@ -5,7 +5,7 @@ import time
 
 from cachetools import TTLCache
 from jwkest.jwk import KEYS
-from util.string import slash_join
+from util import slash_join
 
 logger = logging.getLogger(__name__)
 

util/string.py

@@ -1,13 +0,0 @@
-def slash_join(*args):
-  """
-  Joins together strings and guarantees there is only one '/' in between the
-  each string joined. Double slashes ('//') are assumed to be intentional and
-  are not deduplicated.
-  """
-  def rmslash(path):
-    path = path[1:] if path[0] == '/' else path
-    path = path[:-1] if path[-1] == '/' else path
-    return path
-
-  args = [rmslash(path) for path in args]
-  return '/'.join(args)

util/validation.py

@@ -1,6 +1,5 @@
-import re
 import string
-import anunidecode
+import re
 
 
 INVALID_PASSWORD_MESSAGE = 'Invalid password, password must be at least ' + \