* allocation by various routines. Returns the pointer to the stack
* that must be freed with silc_stack_free function when it is not
* needed anymore. If the `stack_size' is zero (0) by default a
* allocation by various routines. Returns the pointer to the stack
* that must be freed with silc_stack_free function when it is not
* needed anymore. If the `stack_size' is zero (0) by default a