diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index f558664..75eee24 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -11,7 +11,7 @@ on:
       - devel
 
 env:
-  BUILD_TYPE: Release
+  BUILD_TYPE: Debug
 
 jobs:
   build:
@@ -23,7 +23,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Configure CMake
-      run: cmake -B ${{github.workspace}}/build -S . -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_INSTALL_PREFIX=${{github.workspace}}/install
+      run: cmake -B ${{github.workspace}}/build -S . -L -DCMAKE_INSTALL_PREFIX=${{github.workspace}}/install
 
     - name: Build
       run: cmake --build ${{github.workspace}}/build --target install --config ${{env.BUILD_TYPE}}
diff --git a/CHANGELOG b/CHANGELOG
index cd07237..f643e56 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,9 @@
 All changes to the repository will be reported here
 
+## [0.2.2]
+### Fixed
+- Number of nodes allocated in create_graph
+
 ## [0.2.1]
 ### Updated
 - cmake exports
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e9fcc33..b056659 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ Author Marco M. Mosca, email: marcomichele.mosca@gmail.com
 ]]
 
 cmake_minimum_required(VERSION 3.5.0)
-project(graphoc VERSION 0.2.1 LANGUAGES C)
+project(graphoc VERSION 0.2.2 LANGUAGES C)
 
 include(CTest)
 
diff --git a/README.md b/README.md
index d495606..9814293 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,7 @@ int main(int argc, char* argv[]) {
 ## Tests (only on static build)
 ```
 cmake -B build -S . -L -DCMAKE_INSTALL_PREFIX=<install_folder>
-cmake --build .\build --target install --config Release
+cmake --build .\build --target install --config Debug
 cd build
-ctest --build-config Release --build-target install
+ctest --build-config Debug --build-target install
 ```
diff --git a/graphoc/include/graph.h b/graphoc/include/graph.h
index 4b327b3..098f46f 100755
--- a/graphoc/include/graph.h
+++ b/graphoc/include/graph.h
@@ -167,11 +167,11 @@ int save_graph (FILE * nodefile, FILE * edgefile, graph_t* g);
 
 /** Create a graph 
     \param n Number of Nodes
-    \param labels Pointer to array of labels:
+    \param labels Pointer to array of labels with NULL terminator:
     static const char* labels[] = {
         "CAMBRIDGE",
         "LONDON",
-        "MACHESTER",
+        "MANCHESTER",
         "LIVERPOOL",
         NULL,
        };
diff --git a/graphoc/src/graph.c b/graphoc/src/graph.c
index e713309..74bd627 100755
--- a/graphoc/src/graph.c
+++ b/graphoc/src/graph.c
@@ -98,23 +98,21 @@ graph_t * create_graph (unsigned int n, char **labels)
 	errno = EINVAL;
 	if ((labels == NULL) || (n==0)) {return NULL;};
 	errno = ENOMEM;
-	if ((k=malloc(sizeof(graph_t))) == NULL) {return NULL;};
-	nodo=malloc(n * sizeof(node_t));
-	if (nodo == NULL) {free(k);return NULL;};
+	if ((k=(graph_t*)malloc(sizeof(graph_t))) == NULL) {return NULL;};
+	if ((nodo=(node_t*)malloc((n+1) * sizeof(node_t))) == NULL) {free(k);return NULL;};
 	k->size = n;
 	
 	while (i<n && labels[i] != NULL)
 	{
 		len = strlen((const char*) labels[i]); 
-		s=malloc((len) * sizeof(char)+1);
-		if (s== NULL) {return NULL;};
+		if((s=(char*)malloc(len * sizeof(char) + 1)) == NULL) {return NULL;};
 		strcpy(s,(const char*) labels[i]);
-		(nodo+i)->label = s; 
-
+		(nodo+i)->label = s;
 		(nodo+i)->adj = NULL;
 		i++; 
 	}
 	(nodo+i)->label=NULL;
+	(nodo+i)->adj = NULL;
 	k->node = nodo;
 	return k;
 }
@@ -462,16 +460,13 @@ graph_t* load_graph (FILE * nodefile, FILE * edgefile)
 
 int save_graph (FILE * nodefile, FILE * edgefile, graph_t* g)
 {
-	int i=0, len;
+	int i=0;
 	node_t* node;
 	edge_t* ag;
 	double d;
 	unsigned int j;
-	char* s;
 	
 	if((nodefile==NULL) || (edgefile==NULL) || g==NULL) {errno=EINTR;return -1;};
-	
-	s=malloc(3 * sizeof(char));
 	errno=EIO;
 	node = g->node;
 	while((node+i)->label != NULL)
@@ -481,14 +476,11 @@ int save_graph (FILE * nodefile, FILE * edgefile, graph_t* g)
 		while(ag != NULL)
 		{
 			d=ag->weight;
-			sprintf(s,"%f",d);
 			j=ag->label;
-			len = strlen((node+i)->label)+strlen((node+j)->label)+strlen(s);
 			if((fprintf(edgefile, "%s:%s:%.1f\n", (node+i)->label,(node+j)->label,d))<0) {return -1;};
 			ag=ag->next;
 		}
 		i++;
 	} 
-	free(s);
 	return 0;
 }
diff --git a/tests/test_get_degree.c b/tests/test_get_degree.c
index f57f72e..7949f45 100644
--- a/tests/test_get_degree.c
+++ b/tests/test_get_degree.c
@@ -23,7 +23,7 @@ void test_get_degree()
 {
     graph_t* graph;
     if ( ( graph = create_graph(5, labels) ) == NULL )  {
-      exit(EXIT_FAILURE);
+    	exit(EXIT_FAILURE);
     }
 	for(char** p=edges; *p!=NULL; p++){
 		if (  add_edge(graph,*p) == -1 ) {
@@ -40,6 +40,6 @@ void test_get_degree()
 
 int main()
 {
-  test_get_degree();
-  return 0;
+	test_get_degree();
+	return 0;
 }
diff --git a/tests/test_get_edge_count.c b/tests/test_get_edge_count.c
index 2e51750..94f4979 100644
--- a/tests/test_get_edge_count.c
+++ b/tests/test_get_edge_count.c
@@ -21,23 +21,23 @@ Author Marco M. Mosca, email: marcomichele.mosca@gmail.com
 
 void test_get_edge_count()
 {
-    graph_t* graph;
-    if ( ( graph = create_graph(5, labels) ) == NULL )  {
+	graph_t* graph;
+	if ( ( graph = create_graph(5, labels) ) == NULL )  {
 		exit(EXIT_FAILURE);
-    }
-    for(char** e=edges; *e!=NULL; e++){
+	}
+	for(char** e=edges; *e!=NULL; e++){
 		if (  add_edge(graph,*e) == -1 ) {
 			fprintf(stderr, "Adding edge failed: %s", *e);
 			perror("");
 			exit(EXIT_FAILURE);
 		}
-    }
+	}
 	assert(get_edge_count(graph) == 6);
-    free_graph(&graph);
+	free_graph(&graph);
 }
 
 int main()
 {
-  test_get_edge_count();
-  return 0;
+	test_get_edge_count();
+	return 0;
 }