The nng_strdup() duplicates the string src and returns it.
This is logically equivalent to using nng_alloc()
to allocate a region of memory of strlen(s) + 1 bytes, and then
using strcpy() to copy the string into the destination before
returning it.
The returned string should be deallocated with
nng_strfree(), or may be deallocated using the
nng_free() using the length of the returned string plus
one (for the NUL terminating byte).
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Important
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Do not use the system free() or similar functions to deallocate
the string, since those may use a different memory arena!
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