chore: expose get_leaf

rln/librln.h

@@ -94,6 +94,8 @@ bool set_metadata(struct RLN *ctx, const struct Buffer *input_buffer);
 
 bool get_metadata(const struct RLN *ctx, struct Buffer *output_buffer);
 
+bool flush(struct RLN *ctx);
+
 bool hash(const struct Buffer *input_buffer, struct Buffer *output_buffer);
 
 bool poseidon_hash(const struct Buffer *input_buffer, struct Buffer *output_buffer);

rln/wrapper.go

@@ -222,3 +222,14 @@ func (r *RLN) GetRoot() ([]byte, error) {
 
 	return C.GoBytes(unsafe.Pointer(out.ptr), C.int(out.len)), nil
 }
+
+func (r *RLN) GetLeaf(index uint) ([]byte, error) {
+	var output []byte
+	out := toBuffer(output)
+
+	if !bool(C.get_leaf(r.ptr, C.uintptr_t(index), &out)) {
+		return nil, errors.New("could not get the leaf")
+	}
+
+	return C.GoBytes(unsafe.Pointer(out.ptr), C.int(out.len)), nil
+}

zerokit

@@ -1 +1 @@
-Subproject commit 8a365f0c9e5c4a744f70c5dd4904ce8d8f926c34
+Subproject commit 6d583200777aa94131e687e1797af0ba568a66dc