diff --git a/SConscript b/SConscript
index 7f0421e..1d11146 100644
--- a/SConscript
+++ b/SConscript
@@ -1,5 +1,6 @@
 Import('rtconfig')
 from building import *
+import shutil
 
 src = ['perf_counter.c', 'os/perf_os_patch_rt_thread.c']
 
@@ -7,6 +8,19 @@ cwd = GetCurrentDir()
 path = [cwd]
 group = []
 
+#delate unused files
+try:
+    shutil.rmtree(os.path.join(cwd,'.github'))
+    shutil.rmtree(os.path.join(cwd,'.vscode'))
+    shutil.rmtree(os.path.join(cwd,'CI'))
+    shutil.rmtree(os.path.join(cwd,'cmsis-pack'))
+    shutil.rmtree(os.path.join(cwd,'lib'))
+    shutil.rmtree(os.path.join(cwd,'example'))
+    os.remove(os.path.join(cwd,'systick_wrapper_gcc.s'))
+    os.remove(os.path.join(cwd,'systick_wrapper_ual.s'))
+except:
+    pass
+
 group = DefineGroup('perf_counter', src, depend = ['PKG_USING_PERF_COUNTER'], CPPDEFINES = ['__PERF_CNT_USE_RTOS__'], CPPPATH = path)
 
 Return('group')
diff --git a/perf_counter.c b/perf_counter.c
index 6caad47..4fad03b 100644
--- a/perf_counter.c
+++ b/perf_counter.c
@@ -474,7 +474,7 @@ int64_t clock(void)
 /*!
  * \brief get the elapsed cycles since perf_counter is initialised
  *
- * \return int64_t the elpased cycles
+ * \return int64_t the elapsed cycles
  */
 int64_t get_system_ticks(void)
 {