add flag handling and header guards

src/helper_funcs.h

@@ -1,9 +1,16 @@
 #include <curses.h>
 #include <string>
+
+// header guard
+#ifndef _ba_hf_hg_
+#define _ba_hf_hg_
+
 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 print_in_middle(WINDOW *win, int starty, int startx, int width,
                      char *string, chtype color);
-std::string rm_tr_le_whitespace(const std::string &s);
+std::string rm_tr_le_whitespace(const std::string &s);
+
+#endif