[FIX] change flag to stripped

Makefile

@@ -1,7 +1,7 @@
 COMPILER=g++
 #FLAGS=-g -I. -pedantic -Wall -Wextra -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wlogical-op -Wmissing-declarations -Wmissing-include-dirs -Wnoexcept -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-null-sentinel -Wstrict-overflow=5 -Wswitch-default -Wundef -Werror -Wno-unused
 #FLAGS=-g -I.
-FLAGS=-I.
+FLAGS=-s -I.
 O_DIR=obj
 
 CLASS_DIR=src/class