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

char* copy_string_to_heap(char* s) {
    int num_bytes = 0;
    while(s[num_bytes] != '\0') {
        num_bytes += sizeof *s;
    }
    num_bytes += sizeof *s;  // for null terminator '\0'

    char* s_on_heap = malloc(num_bytes * sizeof *s_on_heap);
    for(int i = 0; i < num_bytes; i++) {
        s_on_heap[i] = s[i];
    }

    return s_on_heap;
    // BENEFIT of malloc(…):  Heap memory does not go away (i.e., deallocated/freed)
    //                        when function returns, so the array (string) contents
    //                        will still be there for main(…).
}

int main(int argc, char* argv[]) {
    char s_orig[] = "ABCDEF";
    char* s_copy = copy_string_to_heap(s_orig);

    printf("s_orig == %s\n", s_orig);
    printf("s_copy == %s\n", s_copy);

    free(s_copy);
    s_copy = NULL;

    return EXIT_SUCCESS;
}
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