refactor print in the midle function

src/helper_funcs.h

@@ -1,5 +1,8 @@
+#include <curses.h>
 #include <string>
 void safe_exit(int code);
 std::string bool_to_string(bool bool_in);
 std::string SoRAuthFile(bool save, std::string data);
-void get_input_and_login();
+void get_input_and_login();
+void print_in_middle(WINDOW *win, int starty, int startx, int width,
+                     char *string, chtype color);