-void header_add_phone (Gom_ctxt header, char* phone);
-void header_add_to_note(NL_TYPE type, Gom_ctxt header, char* str);
+void header_add_phone (Gom_ctxt header, const char* phone);
+void header_add_to_note(NL_TYPE type, Gom_ctxt header, const char* str);