Is casting to pointers to pointers to void always safe?

Question

#include 

void swap(void *v[], int i, int j)
{
    void *tmp;

    tmp = v[i];
    v[i] = v[j];
    v[j] = tmp;
}

int main(void)
{
    char *s[] = {         


        

Answer 1

To avoid the warning call the function as follows,

swap((void *) s, 0, 1);

It is always safe to cast any pointer as a void pointer.