diff --git a/binary-tree-core-0 b/binary-tree-core-0
index 58be1f0..3ce0bff 160000
--- a/binary-tree-core-0
+++ b/binary-tree-core-0
@@ -1 +1 @@
-Subproject commit 58be1f002339ddf6d56f2c38fea830f67a59dc9c
+Subproject commit 3ce0bffc1c08ce462bc69f86c9b97d963f8e6ff0
diff --git a/src/algo/add.kt b/src/algo/add.kt
new file mode 100644
index 0000000..bf87ec0
--- /dev/null
+++ b/src/algo/add.kt
@@ -0,0 +1,79 @@
+    fun balanceAfterLinking(node: NODE) {
+        this._setColor(node, Color.RED)
+        var current: NODE = node
+
+        while (true) {
+            val parent = this._getParent(current)
+            if (parent == null) {
+                current.__assertIsRoot()
+                this._setColor(current, Color.BLACK)
+                break
+            }
+            if (this._getColor(parent) == Color.BLACK) {
+                break
+            }
+
+            val grandParent = this._getParent(parent)
+            if (grandParent == null) {
+                parent.__assertIsRoot()
+                this._setColor(parent, Color.BLACK)
+                break
+            }
+
+            when {
+                this._checkSame(parent, this._getLeftChild(grandParent)) -> {
+                    val uncle = this._getRightChild(grandParent)
+                    if (uncle != null && this._getColor(uncle) == Color.RED) {
+                        this._setColor(parent, Color.BLACK)
+                        this._setColor(uncle, Color.BLACK)
+                        this._setColor(grandParent, Color.RED)
+                        current = grandParent
+                        continue
+                    }
+
+                    when {
+                        this._checkSame(current, this._getLeftChild(parent)) -> {
+                            this.__rotateRight_Switch(grandParent)
+                            continue
+                        }
+
+                        this._checkSame(current, this._getRightChild(parent)) -> {
+                            this.__rotateLeft_Left(parent, grandParent)
+                            current = parent
+                            continue
+                        }
+
+                        else -> this.__throwTreeCorruptedNotChild(current, parent)
+                    }
+                }
+
+                this._checkSame(parent, this._getRightChild(grandParent)) -> {
+                    val uncle = this._getLeftChild(grandParent)
+                    if (uncle != null && this._getColor(uncle) == Color.RED) {
+                        this._setColor(parent, Color.BLACK)
+                        this._setColor(uncle, Color.BLACK)
+                        this._setColor(grandParent, Color.RED)
+                        current = grandParent
+                        continue
+                    }
+
+                    when {
+                        this._checkSame(current, this._getRightChild(parent)) -> {
+                            this.__rotateLeft_Switch(grandParent)
+                            continue
+                        }
+
+                        this._checkSame(current, this._getLeftChild(parent)) -> {
+                            this.__rotateRight_Right(parent, grandParent)
+                            current = parent
+                            continue
+                        }
+
+                        else -> this.__throwTreeCorruptedNotChild(current, parent)
+                    }
+                }
+
+                else -> this.__throwTreeCorruptedNotChild(parent, grandParent)
+            }
+        }
+    }
\ No newline at end of file
diff --git a/src/algo/add.rs b/src/algo/add.rs
new file mode 100644
index 0000000..bed5850
--- /dev/null
+++ b/src/algo/add.rs
@@ -0,0 +1,125 @@
+use crate::context::{Color, RedBlackTreeColorContext};
+use binary_tree_core_0::NodeRefContainer;
+use binary_tree_core_0::base_context::{
+    BinaryTreeChildrenGetterContext, BinaryTreeDirection, BinaryTreeDirectionDispatcherClojure,
+    BinaryTreeRootGetter,
+};
+use binary_tree_core_0::directed_context::{DirectedBinaryTreeChildrenGetterContext, DynamicDirectedBinaryTreeContextFromContext};
+use binary_tree_core_0::relation_context::{
+    BinaryTreeRelationSetterContext, BinaryTreeRootRelationSetterContext,
+};
+
+pub trait AddRecContext:
+    BinaryTreeRootGetter
+    + BinaryTreeChildrenGetterContext
+    + BinaryTreeRootRelationSetterContext
+    + BinaryTreeRelationSetterContext
+    + BinaryTreeDirectionDispatcherClojure
+    + RedBlackTreeColorContext
+{
+}
+
+pub fn add_recursive<Ctx: AddRecContext>(ctx: &mut Ctx, newNode: Ctx::NodeRef) {
+    ctx.clearLeftChild(newNode.clone());
+    ctx.clearRightChild(newNode.clone());
+    ctx.setColor(newNode.clone(), Color::RED);
+
+    let node = ctx.getRoot();
+    match node {
+        None => {
+            ctx.setColor(newNode.clone(), Color::BLACK);
+            ctx.setRootRelation(newNode);
+            return;
+        }
+        Some(node) => {
+            let dir = ctx
+                .determineDirection(node.clone())
+                .unwrap_or(BinaryTreeDirection::LEFT);
+            let child;
+            match dir {
+                BinaryTreeDirection::LEFT => child = ctx.getLeftChild(node.clone()),
+                BinaryTreeDirection::RIGHT => child = ctx.getRightChild(node.clone()),
+            }
+            _add_recursive(ctx, None, None, (node.clone(), dir), child, newNode);
+            ctx.setColor(node, Color::BLACK)
+        }
+    }
+}
+
+fn _add_recursive<Ctx: AddRecContext>(
+    ctx: &mut Ctx,
+    grandgrandparent: Option<(Ctx::NodeRef, BinaryTreeDirection)>,
+    grandparent: Option<(Ctx::NodeRef, BinaryTreeDirection)>,
+    parent: (Ctx::NodeRef, BinaryTreeDirection),
+    _node: Option<Ctx::NodeRef>,
+    newNode: Ctx::NodeRef,
+) {
+    let node;
+    match _node {
+        None => {
+            match parent.1 {
+                BinaryTreeDirection::LEFT => ctx.setLeftRelation(parent.0.clone(), newNode.clone()),
+                BinaryTreeDirection::RIGHT => {
+                    ctx.setRightRelation(parent.0.clone(), newNode.clone())
+                }
+            }
+            node = newNode;
+        }
+        Some(_node) => {
+            node = _node;
+            let childDir = ctx
+                .determineDirection(node.clone())
+                .unwrap_or(BinaryTreeDirection::LEFT);
+            let child;
+            match childDir {
+                BinaryTreeDirection::LEFT => child = ctx.getLeftChild(node.clone()),
+                BinaryTreeDirection::RIGHT => child = ctx.getRightChild(node.clone()),
+            }
+            _add_recursive(
+                ctx,
+                grandparent.clone(),
+                Some(parent.clone()),
+                (node.clone(), childDir),
+                child,
+                newNode,
+            );
+        }
+    }
+
+    if ctx.getColor(parent.0.clone()) == Color::BLACK {
+        return; // todo break
+    }
+    match grandparent {
+        None => {
+            ctx.setColor(parent.0, Color::BLACK);
+            return; // todo break
+        }
+        Some(grandparent) => {
+            let mut symCtx = DynamicDirectedBinaryTreeContextFromContext::wrap_mut(ctx, grandparent.1);
+            let uncle = symCtx.getOppositeChild(grandparent.0.clone());
+            if let Some(uncle) = uncle {
+                if ctx.getColor(uncle.clone()) == Color::RED {
+                    ctx.setColor(parent.0, Color::BLACK);
+                    ctx.setColor(uncle, Color::BLACK);
+                    ctx.setColor(grandparent.0, Color::RED);
+                    return; // todo current = grandparent
+                }
+            }
+
+            match grandparent.1 == parent.1 {
+                true => {
+                    todo!("__rotateOpposite_Switch(grandParent)");
+                    return; // todo continue
+                },
+                false => {
+                    todo!("__rotateForward_Forward(parent, grandParent)");
+                    return; // todo current = parent
+                },
+            }
+
+
+        }
+    }
+}
+
+
diff --git a/src/algo/mod.rs b/src/algo/mod.rs
new file mode 100644
index 0000000..b4128ae
--- /dev/null
+++ b/src/algo/mod.rs
@@ -0,0 +1 @@
+mod add;
\ No newline at end of file
diff --git a/src/context.rs b/src/context.rs
new file mode 100644
index 0000000..3708f20
--- /dev/null
+++ b/src/context.rs
@@ -0,0 +1,12 @@
+use binary_tree_core_0::NodeRefContainer;
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub enum Color {
+    BLACK,
+    RED,
+}
+
+pub trait RedBlackTreeColorContext: NodeRefContainer {
+    fn getColor(&self, node: Self::NodeRef) -> Color;
+    fn setColor(&self, node: Self::NodeRef, color: Color);
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..68d7b63
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,4 @@
+mod algo;
+mod context;
+
+