fix: fixed problems with init and destroy slice

src/arraylist.c

@@ -46,6 +46,7 @@ ArrayList *arraylist_init(size_t capacity, size_t elem_size) {
     arr->capacity = capacity;
     arr->elem_size = elem_size;
     arr->len = 0;
+    arr->borrows = 0;
     arr->buffer = malloc(capacity * elem_size);
     if (arr->buffer == NULL) {
         free(arr);
@@ -496,6 +497,10 @@ ArrayListErr arrayslice_destroy(ArraySlice **slice) {
         return ARRLIST_NULL_ARG;
     }
 
+    if ((*slice)->is_safe) {
+        (*slice)->arr->borrows--;
+    }
+
     free(*slice);
     *slice = NULL;