为什么电动栅栏/阀研磨不能抓住这个缓冲溢出问题?

I have created a buggy program - buggy.c - this is a buffer-overflow scenario for buffer t. You can see that I am writing more than 5 indexes. It works fine. It never throws me an error. I was wondering, why is it like that? I tried even Valgrind, this also couldn't find this issue. Can you tell me please what is the issue here?I have created a buggy program - buggy.c - this