demo which shows how to rewind string pointer

rewind-string-pointer.c

// run with: `gcc main.c -include stdio.h && ./a.out`

int main() {
    char *foo = "foo";
    char *bar = foo;
    char *begin = bar;
    while (*bar++) {}
    bar = begin;
    printf("%s\n", bar); // foo
    return 0;
}