feat(heap): code skeleton

include/vieter_heap.h

@@ -0,0 +1,26 @@
+#ifndef VIETER_HEAP
+#define VIETER_HEAP
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef struct vieter_heap vieter_heap;
+
+typedef enum vieter_heap_error {
+    vieter_heap_ok = 0,
+    vieter_heap_empty = 1
+} vieter_heap_error;
+
+vieter_heap *vieter_heap_init();
+
+void vieter_heap_free(vieter_heap *heap);
+
+uint64_t vieter_heap_size(vieter_heap *heap);
+
+vieter_heap_error vieter_heap_insert(vieter_heap *heap, uint64_t key, void *data);
+
+vieter_heap_error vieter_heap_pop(void **out, vieter_heap *heap);
+
+vieter_heap_error vieter_heap_peek(void **out, vieter_heap *heap);
+
+#endif