void f(char* p) {
    char s[] = "ABCD";            //1
    const char* pc = s;           //2
    pc[3] = 'd';                  //3
    pc = p;                       //4 

    char* const cp = s;           //5
    cp[3] = 'f';                  //6
    cp = p;                       //7

    const char* const cpc = s;    //8
    cpc[3] = 'a';                 //9
    cpc = p;                      //10
}