diff --git a/src/wte.c b/src/wte.c
index c353686..42a1a3d 100644
--- a/src/wte.c
+++ b/src/wte.c
@@ -1,21 +1,6 @@
-#include <stdio.h>
-
-#ifdef DEBUG
-#define dbg(format, ...) do { \
-  printf("\033[1;35m[DEBUG] (func: %s) msg:\033[0;35m " format "\033[0m\n",__func__, __VA_ARGS__); \
-} while(0)
-#else
-#define dbg(format, ...)
-#endif
-
-#define c_red "\033[1;31m"
-#define c_green "\033[1;32m"
-#define c_yellow "\033[1;33m"
-#define c_end "\033[0m"
-
-#define error(format, ...) do {\
-  fprintf(stderr, c_red "[ERROR] "format c_end"\n", __VA_ARGS__); \
-} while(0)
+#include <time.h>
+#include <stdlib.h>
+#include "wte.h"
 
 
 static int get_proposition()
diff --git a/src/wte.h b/src/wte.h
new file mode 100644
index 0000000..b11abed
--- /dev/null
+++ b/src/wte.h
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#define error(format, ...) do {\
+  fprintf(stderr, c_red "[ERROR] "format c_end"\n", __VA_ARGS__); \
+} while(0)
+
+#ifdef DEBUG
+#define dbg(format, ...) do { \
+  printf("\033[1;35m[DEBUG] (func: %s) msg:\033[0;35m " format "\033[0m\n",__func__, __VA_ARGS__); \
+} while(0)
+#else
+#define dbg(format, ...)
+#endif
+
+#define c_red "\033[1;31m"
+#define c_green "\033[1;32m"
+#define c_yellow "\033[1;33m"
+#define c_end "\033[0m"
+
+/* path to data storage */
+#define DATA_DIR "/.local/share/wte"
+
+/* get full path to data storage (with "/home/$USER/"-prefix) */
+char *get_path();
+
+/* data storage creation / deletion */
+int create_data_dir();
+int remove_data_dir();
+
+/* operating on data storage */
+int insert_choice();
+int remove_choice();