diff --git a/base/run_command.py b/base/run_command.py
index 7f6230d..c46352d 100644
--- a/base/run_command.py
+++ b/base/run_command.py
@@ -1,21 +1,24 @@
 #!/usr/bin/env python
-import subprocess
 import re
+import subprocess
+
 
 class MessageType:
     STATUS = 1
     MESSAGE = 2
 
+
 class Message(object):
     def __init__(self, message, type):
         self.message_ = message
         self.type_ = type
 
     def message(self):
-        return  self.message_
+        return self.message_
 
     def type(self):
-        return  self.type_
+        return self.type_
+
 
 class Policy(object):
     def __init__(self, cb):
@@ -30,10 +33,12 @@ class Policy(object):
         self.progress_ = progress
         self.process(Message(message, MessageType.STATUS))
 
+
 class CommonPolicy(Policy):
     def __init__(self, cb):
         Policy.__init__(self, cb)
 
+
 class CmakePolicy(Policy):
     def __init__(self, cb):
         Policy.__init__(self, cb)
@@ -45,6 +50,7 @@ class CmakePolicy(Policy):
     def update_progress_message(self, progress, message):
         super(CmakePolicy, self).update_progress_message(progress, message)
 
+
 class MakePolicy(Policy):
     def __init__(self, cb):
         Policy.__init__(self, cb)
@@ -74,6 +80,7 @@ class MakePolicy(Policy):
 
         return None
 
+
 class NinjaPolicy(Policy):
     def __init__(self, cb):
         Policy.__init__(self, cb)
@@ -83,7 +90,7 @@ class NinjaPolicy(Policy):
             super(NinjaPolicy, self).process(message)
             return
 
-        cur,total = self.parse_message_to_get_range(message.message())
+        cur, total = self.parse_message_to_get_range(message.message())
         if not cur and not total:
             return
 
@@ -103,9 +110,8 @@ class NinjaPolicy(Policy):
 
         return None, None
 
-def run_command_cb(cmd, policy):
-    if not policy:
-        policy = Policy
+
+def run_command_cb(cmd: list, policy=Policy):
     try:
         policy.update_progress_message(0.0, 'Command {0} started'.format(cmd))
         process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
@@ -118,4 +124,4 @@ def run_command_cb(cmd, policy):
         policy.update_progress_message(100.0, 'Command {0} finished with exception {1}'.format(cmd, str(ex)))
         raise ex
 
-    return rc
\ No newline at end of file
+    return rc
diff --git a/base/system_info.py b/base/system_info.py
index 501fe81..2a82362 100644
--- a/base/system_info.py
+++ b/base/system_info.py
@@ -276,3 +276,10 @@ SUPPORTED_BUILD_SYSTEMS = [BuildSystem('ninja', ['ninja'], '-GNinja'),
 
 def get_supported_build_system_by_name(name) -> BuildSystem:
     return next((x for x in SUPPORTED_BUILD_SYSTEMS if x.name() == name), None)
+
+
+def stable_path(path) -> str:
+    if get_os() == 'windows':
+        return '/' + path.replace("\\", "/").replace(":", '')
+
+    return path.replace("\\", "/").replace(":", '')
diff --git a/base/utils.py b/base/utils.py
index d403612..ed7c94e 100644
--- a/base/utils.py
+++ b/base/utils.py
@@ -2,9 +2,9 @@
 
 import os
 import re
+import shutil
 import subprocess
 import tarfile
-import shutil
 from urllib.request import urlopen