Nice Kata but a bit easy for 5

In C, although it passes the fixed tests, it fails at random ones with the following error message:

Test Crashed
Caught unexpected signal: 6

free(): invalid pointer

?

definately best practise

so an iterative way would work?

as usual, I have read this before but nothing helped

I have figured the logic behind this, but my only problem (im in C) is that since it gives us only the const message string and expects us to return a pointer to a char array, how is this possible? everything inside the function will have a local address

I managed to succesfully solve this in my computer and perfectly works on all test cases, but when I attempt or test it here, it says that the test has been passed but a crash occured (unexpected signal) I'm in C lang

Caught unexpected signal: SIGSEGV (11). Invalid memory access.