diff --git a/src/io.c b/src/io.c
index 4184aa1b8c45ad118a660d08986fc7e2c4cb583b..d6cce4ba75d621b906877d4cd0901dd54f8d94a3 100644
--- a/src/io.c
+++ b/src/io.c
@@ -5,14 +5,14 @@
 #include "vector.h"
 
 
-int_t read_int(FILE* file) {
+int_t io_read_int(FILE* file) {
 	char* line;
 	size_t len;
 	getline(&line, &len, file);
 	return strtol(line, NULL, 10);
 }
 
-fpt_t read_fpt(FILE* file) {
+fpt_t io_read_fpt(FILE* file) {
 	char* line;
 	size_t len;
 	getline(&line, &len, file);
@@ -20,7 +20,7 @@ fpt_t read_fpt(FILE* file) {
 }
 
 
-vector_int_t* line_to_vector_int(char* line, const size_t dim) {
+vector_int_t* io_line_to_vector_int(char* line, const size_t dim) {
 	vector_int_t* vector = vector_create_int(dim);
 	char* tgt = line;
 	char* token = NULL;
@@ -32,7 +32,7 @@ vector_int_t* line_to_vector_int(char* line, const size_t dim) {
 	return vector;
 }
 
-vector_fpt_t* line_to_vector_fpt(char* line, const size_t dim) {
+vector_fpt_t* io_line_to_vector_fpt(char* line, const size_t dim) {
 	vector_fpt_t* vector = vector_create_fpt(dim);
 	char* tgt = line;
 	char* token = NULL;
@@ -45,13 +45,13 @@ vector_fpt_t* line_to_vector_fpt(char* line, const size_t dim) {
 }
 
 
-list_points_int_t* get_vector_list_int(FILE* ifile, const size_t dim) {
+list_points_int_t* io_get_vector_list_int(FILE* ifile, const size_t dim) {
 	list_points_int_t* list = list_points_create_int();
 	char* line = NULL;
 	size_t len = 0;
 	while (getline(&line, &len, ifile) != -1) {
 		if (len != 0) {
-			vector_int_t* vector = line_to_vector_int(line, dim);
+			vector_int_t* vector = io_line_to_vector_int(line, dim);
 			list_points_append_int(list, vector);
 			free(line);
 		}
@@ -59,13 +59,13 @@ list_points_int_t* get_vector_list_int(FILE* ifile, const size_t dim) {
 	return list;
 }
 
-list_points_fpt_t* get_vector_list_fpt(FILE* ifile, const size_t dim) {
+list_points_fpt_t* io_get_vector_list_fpt(FILE* ifile, const size_t dim) {
 	list_points_fpt_t* list = list_points_create_fpt();
 	char* line = NULL;
 	size_t len = 0;
 	while (getline(&line, &len, ifile) != -1) {
 		if (len != 0) {
-			vector_fpt_t* vector = line_to_vector_fpt(line, dim);
+			vector_fpt_t* vector = io_line_to_vector_fpt(line, dim);
 			list_points_append_fpt(list, vector);
 			free(line);
 		}
diff --git a/src/io.h b/src/io.h
index a5d5957a012679020123f0a0f125bed738ef85d2..b069cb46498812b7f74195acba2da0209fd4e2cd 100644
--- a/src/io.h
+++ b/src/io.h
@@ -8,19 +8,19 @@
 #include "vector.h"
 
 
-int_t read_int(FILE* file);
+int_t io_read_int(FILE* file);
 
-fpt_t read_fpt(FILE* file);
+fpt_t io_read_fpt(FILE* file);
 
 
-vector_int_t* line_to_vector_int(char* line, const size_t dim);
+vector_int_t* io_line_to_vector_int(char* line, const size_t dim);
 
-vector_fpt_t* line_to_vector_fpt(char* line, const size_t dim);
+vector_fpt_t* io_line_to_vector_fpt(char* line, const size_t dim);
 
 
-list_points_int_t* get_vector_list_int(FILE* ifile, const size_t dim);
+list_points_int_t* io_get_vector_list_int(FILE* ifile, const size_t dim);
 
-list_points_fpt_t* get_vector_list_fpt(FILE* ifile, const size_t dim);
+list_points_fpt_t* io_get_vector_list_fpt(FILE* ifile, const size_t dim);
 
 
 void io_write_clusters_to_file_int(FILE* file, cluster_int_t** clusters, const size_t cluster_count);
diff --git a/src/main.c b/src/main.c
index b24a09940a5515a0c5a58ad1c46afcf96bc42ace..11474cf50fff7d5a268108c500c2ee02c7c5fd04 100644
--- a/src/main.c
+++ b/src/main.c
@@ -28,21 +28,27 @@ bool init(int argc, char** argv, char** ipath, char** opath) {
 			fprintf(stderr, "IFILE:   [ %s ]   file does not exist !", *ipath);
 			return false;
 		}
+	} else {
+		*ipath = NULL;
 	}
-	if (argc > 2) *opath = argv[2];
+	*opath = argc > 2 ? argv[2] : NULL;
+	return true;
+}
+
+
+void read_points_int(const char* ipath) {
+
 }
 
 
 int main(int argc, char** argv) {
 	// INIT
-	char* ipath = NULL;
-	char* opath = NULL;
-	if (!init(argc, argv, &ipath, &opath))
-		return EXIT_FAILURE;
+	char (* ipath), (* opath);
+	if (!init(argc, argv, &ipath, &opath)) return EXIT_FAILURE;
 	// READ
 	FILE* ifile = ipath != NULL ? fopen(ipath, "r") : stdin;
-	const size_t dim = read_int(ifile);
-	const size_t nb_clusters = read_int(ifile);
+	const size_t dim = io_read_int(ifile);
+	const size_t nb_clusters = io_read_int(ifile);
 	if (0 <= dim) {
 		printf("DIMENSION MUST BE STRICTLY POSITIVE !\n");
 		return EXIT_FAILURE;
@@ -51,20 +57,20 @@ int main(int argc, char** argv) {
 		printf("NUMBER OF CLUSTERS MUST BE STRICTLY POSITIVE !\n");
 		return EXIT_FAILURE;
 	}
-	list_points_int_t* list = get_vector_list_int(ifile, dim);
+	list_points_int_t* list = io_get_vector_list_int(ifile, dim);
 	fclose(ifile);
 	ifile = NULL;
 	const size_t point_count = list->size;
-	point_int_t** points = list_points_to_array_int(list);
+	vector_int_t** points = list_points_to_array_int(list);
 	list_points_destroy_int(list, false);
 	list = NULL;
 	// ALGORITHM
-	vector_int_t** clusters = kmeans_init_clusters_int((const point_int_t**) points, point_count, nb_clusters);
+	cluster_int_t** clusters = kmeans_init_clusters_int((const vector_int_t**) points, point_count, nb_clusters);
 	kmeans_int(points, point_count, clusters, nb_clusters, distance_euclid_int);  //TODO: choose dist func with command line
 	// WRITE
 	FILE* ofile = opath != NULL ? fopen(opath, "w") : stdout;
 	fprintf(ofile, "%lud\n%lud\n", dim, nb_clusters);
-	io_write_clusters_to_file_int(ofile, points, point_count);
+	io_write_clusters_to_file_int(ofile, clusters, point_count);
 	fclose(ofile);
 	return EXIT_SUCCESS;
 }