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$ gcc main.c llist.c heap.c -o heap_test && ./heap_test
heap.c:6:27: warning: cast to 'node_t *' (aka 'struct node_t *') from smaller integer type 'uint32_t' (aka 'unsigned int') [-Wint-to-pointer-cast]
    node_t *init_region = (node_t *) start;
                          ^
heap.c:12:5: warning: implicit declaration of function 'add_node' is invalid in C99 [-Wimplicit-function-declaration]
    add_node(heap->bins[get_bin_index(init_region->size)], init_region);
    ^
heap.c:21:21: warning: implicit declaration of function 'get_best_fit' is invalid in C99 [-Wimplicit-function-declaration]
    node_t *found = get_best_fit(temp, size);
                    ^
heap.c:21:13: warning: incompatible integer to pointer conversion initializing 'node_t *' (aka 'struct node_t *') with an expression of type 'int' [-Wint-conversion]
    node_t *found = get_best_fit(temp, size);
            ^       ~~~~~~~~~~~~~~~~~~~~~~~~
heap.c:25:15: warning: incompatible integer to pointer conversion assigning to 'node_t *' (aka 'struct node_t *') from 'int' [-Wint-conversion]
        found = get_best_fit(temp, size);
              ^ ~~~~~~~~~~~~~~~~~~~~~~~~
heap.c:29:17: warning: incompatible pointer types initializing 'node_t *' (aka 'struct node_t *') with an expression of type 'char *' [-Wincompatible-pointer-types]
        node_t *split = ((char *) found + sizeof(node_t) + sizeof(footer_t)) + size;
                ^       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
heap.c:44:5: warning: implicit declaration of function 'remove_node' is invalid in C99 [-Wimplicit-function-declaration]
    remove_node(heap->bins[index], found);
    ^
heap.c:67:14: warning: comparison between pointer and integer ('node_t *' (aka 'struct node_t *') and 'uint32_t' (aka 'unsigned int'))
    if (head == heap->start) {
        ~~~~ ^  ~~~~~~~~~~~
heap.c:74:20: warning: cast to 'node_t *' (aka 'struct node_t *') from smaller integer type 'uint32_t' (aka 'unsigned int') [-Wint-to-pointer-cast]
    node_t *prev = (node_t *) * ((uint32_t *) ((char *) head - sizeof(footer_t)));
                   ^
heap.c:108:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
heap.c:135:41: warning: cast to 'char *' from smaller integer type 'uint32_t' (aka 'unsigned int') [-Wint-to-pointer-cast]
    footer_t *wild_foot = (footer_t *) ((char *) heap->end - sizeof(footer_t));
                                        ^
11 warnings generated.
[1]    3559 segmentation fault  ./heap_test

    while (found == NULL) {
        if(index >= BIN_COUNT)
            return NULL;

        temp = heap->bins[++index];
        found = get_best_fit(temp, size);
    }