refactor: use -o flag in Makefile targets.

Makefile

@@ -20,13 +20,13 @@ build:
 	chmod +x ${BINARY_NAME}
 
 run: build
-	./${BINARY_NAME} -f ./samples/$(TEST).txt > program.out
+	./${BINARY_NAME} -f ./samples/$(TEST).txt -o program.out
 
 profile: build
-	./${BINARY_NAME} -p profile/cpu.prof -f ./samples/$(TEST).txt > program.out
+	./${BINARY_NAME} -p profile/cpu.prof -f ./samples/$(TEST).txt -o program.out
 
 explain: build
-	./${BINARY_NAME} -x -p profile/cpu.prof -f ./samples/$(TEST).txt > program.out
+	./${BINARY_NAME} -x -p profile/cpu.prof -f ./samples/$(TEST).txt -o program.out
 
 graph:
 	go tool pprof -raw -output=profile/cpu.raw profile/cpu.prof