Struct Test

main.c

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

typedef struct {
    int num;
    void **elems;
} test_t;

void elem_append(test_t* test_str, void* elem_app) {
    *test_str->elems = elem_app;
}

int main(int argc, char** argv) {
    test_t* my_str = (test_t*) malloc(sizeof(test_t));
    my_str->elems = malloc(sizeof(void*));
    
    printf("Before: '%s'\n", *my_str->elems);
    
    char* new_str = "I am the new element!";
    
    elem_append(my_str, new_str);
    
    printf("After '%s'\n", *my_str->elems);
    return (EXIT_SUCCESS);
}