Mkdir -p bin folder

makefile

@@ -1,4 +1,4 @@
-CC ?= g++
+CC = g++
 CFLAGS = -std=c++17 -Wall -g
 LFLAGS = -lstdc++fs
 
@@ -21,7 +21,7 @@ ${BINARY_OUT}: directories ${OBJS}
 	${CC} ${CFLAGS} -MMD -c $< -o $@
 
 ${BINARY_OUT_BIN}: ${BINARY_OUT}
-	mkdir ./bin
+	mkdir -p ./bin
 	cp -u $^ $@
 
 .PHONY: all clean check tests syntax directories