base layout for multithreading

backend.h

@@ -0,0 +1,8 @@
+#include <curses.h>
+#include "backend.c"
+
+
+void get_dir_size(char *path, unsigned long *file_count, unsigned long *longest_name, char show_hidden);
+void get_dir_content(char *path, char **dir_content, char show_hidden);
+void print_dir(WINDOW *win, char **dir_content);
+void *populate_dir(void *dir);