#include <stdio.h>
#include <stdlib.h>

int main(int argc, char* argv[]) {

    char abc[] = "abc";
    char xyz[] = "xyz";

    char* x    = &(xyz[0]);
    char* s    = &(abc[0]);

    char** const a_s = &s;   // protecting the characters themselves
    // Do not modify *a_s
    
    //a_s = &x;      // BAD!!!
    *a_s  =   x;     // OK
    **a_s = 'A';     // OK

    printf("*a_s == %s\n", *a_s);


    return EXIT_SUCCESS;
}
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