it's a matter of memory management. first thing: printf your output before your return statement to see what you're actually returning. this will give you a start on what you need to fix

In C,

Either the test crashes or I also get this error:

The expression strcmp(result, "hello hello hello ") == 0 is false.

And when I run it else where it is not return false.

I'm using malloc - is that the problem?

Cheers,