const char *const test_string = "test string";
const size_t test_string_length = strlen(test_string) + 1;
const size_t arr_size = 16;
char mallocated = malloc(arr_size + sizeof(char));
if(test_string_length <= arr_size){
    memcpy(mallocated, test_string, test_string_length);
    printf("Copied with offset = %s\n", mallocated + 5);   // <------- Here
} else {
    fprintf(stderr, "The string %s is too long\n", test_string);
}