Python programmer casually flexing about solving problems in 3 lines while the C++ programmer is over there having a full existential crisis. Classic high-level vs low-level language showdown. Python devs get to import a library that does everything, write a list comprehension, and call it a day. Meanwhile the C++ crowd is manually managing memory, dealing with pointers, template metaprogramming, and questioning their life choices just to accomplish the same thing in 300 lines. Both get the job done. One just requires significantly less therapy afterward.

So someone told you stack allocation is faster than heap allocation, and you took that advice a bit too literally. The function allocates a char array on the stack and then returns a pointer to it. Problem? That stack memory gets deallocated the moment the function returns, so you're handing back a pointer to memory that's already been reclaimed. It's like giving someone directions to a house that's been demolished. The comment "delicious segfault awaits" is chef's kiss accurate. Whoever tries to dereference that returned pointer is in for undefined behavior territory—could be garbage data, could be a crash, could be nothing at all until production when it spectacularly explodes. Stack allocation is faster, but returning stack-allocated memory is basically writing a check your program can't cash. Classic case of knowing just enough to be dangerous. Should've used malloc or just passed a buffer as a parameter. But hey, at least it compiles! (with warnings you definitely ignored)