Add priority queue

tests/test_priority_queue.c

@@ -0,0 +1,31 @@
+#include <htd/primitives/primitives.h>
+#include <htd/data_structure/priority_queue.h>
+
+#include <assert.h>
+#include <stdio.h>
+
+isize i32_compare(void *a, void *b) {
+    return *(int *)a - *(int *)b;
+}
+
+int main() {
+    PriorityQueue pq;
+    prioq_init(&pq, sizeof(i32), i32_compare);
+
+    i32 values[] = {4, 1, 10, 33, 0};
+
+    for (i32 i = 0; i < 5; i++) {
+        prioq_push(&pq, &values[i]);
+    }
+
+    i32 correct[] = {0, 1, 4, 10, 33};
+    for (i32 i = 0; i < 5; i++) {
+        i32 value;
+        prioq_pop(&pq, &value);
+        printf("value: %d\n", value);
+        assert(value == correct[i]);
+    }
+
+    prioq_free(&pq);
+    return 0;
+}