diff --git a/Makefile b/Makefile
index 49674a6..ee03ff6 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,8 @@ SHELL := /bin/bash
 
 clean: ## Clean up
 	rm -rf build dist *.egg-info
-	for name in fimdlp/cfimdlp.cpp fimdlp/fimdlp.cpython-310-darwin.so;do if [ -f $name ]; then rm $name; fi; done
+	if [ -f fimdlp/cfimdlp.cpp ]; then rm fimdlp/cfimdlp.cpp; fi;
+	if [ -f fimdlp/cppfimdlp.cpython-310-darwin.so ]; then rm fimdlp/cppfimdlp.cpython-310-darwin.so; fi;
 
 lint:  ## Lint and static-check
 	black fimdlp
@@ -21,7 +22,9 @@ build:  ## Build package
 buildext:  ## Build extension
 	rm -fr dist/*
 	rm -fr build/*
+	make clean
 	python setup.py build_ext
+	echo "Build extension success"; mv build/lib.macosx-12-x86_64-cpython-310/cppfimdlp.cpython-310-darwin.so fimdlp;
 
 audit: ## Audit pip
 	pip-audit
diff --git a/fimdlp/CPPFImdlp.cpp b/fimdlp/CPPFImdlp.cpp
index 3600959..5f9039b 100644
--- a/fimdlp/CPPFImdlp.cpp
+++ b/fimdlp/CPPFImdlp.cpp
@@ -10,14 +10,18 @@ namespace CPPFImdlp
     std::vector<float> CPPFImdlp::cutPoints(std::vector<int> &X, std::vector<int> &y)
     {
         std::vector<float> cutPts;
-        int i, ant = X.at(0);
+        int i, ant = X.at(0), anty = y.at(0);
         int n = X.size();
         for (i = 1; i < n; i++)
         {
             if (X.at(i) != ant)
             {
-                cutPts.push_back(float(X.at(i) + ant) / 2);
-                ant = X.at(i);
+                if (y.at(i) != anty)
+                {
+                    cutPts.push_back(float(X.at(i) + ant) / 2);
+                    ant = X.at(i);
+                    anty = y.at(i);
+                }
             }
         }
         return cutPts;
diff --git a/fimdlp/cppfimdlp.cpython-310-darwin.so b/fimdlp/cppfimdlp.cpython-310-darwin.so
index c553ecc..4e5cb5b 100755
Binary files a/fimdlp/cppfimdlp.cpython-310-darwin.so and b/fimdlp/cppfimdlp.cpython-310-darwin.so differ