diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..8b543d3
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,47 @@
+name: ci
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+permissions:
+  contents: read
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - run: cargo fmt --all -- --check
+
+  clippy:
+    name: Clippy
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - run: cargo clippy --all-targets --all-features -- -D warnings
+
+  test:
+    name: Tests
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo test --all-targets --all-features --verbose
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index b84d9e2..0000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,36 +0,0 @@
-image: "rust:latest"
-
-variables:
-  RUSTFLAGS: -D warnings
-
-default:
-  before_script:
-    - rustc --version 
-    - cargo --version
-  tags:
-    - shared-fi
-
-stages:
-  - build
-
-build:
-  stage: build
-  script:
-    - cargo build --verbose
-
-lint:
-  stage: build
-  script:
-    - rustup component add clippy
-    - cargo clippy --all-targets
-    
-format:
-  stage: build
-  script:
-    - rustup component add rustfmt
-    - cargo fmt -- --check
-
-test:
-  stage: build
-  script:
-    - cargo test
\ No newline at end of file
diff --git a/.gitlab/issue_templates/Bug.md b/.gitlab/issue_templates/Bug.md
deleted file mode 100644
index a60a536..0000000
--- a/.gitlab/issue_templates/Bug.md
+++ /dev/null
@@ -1,28 +0,0 @@
-# Summary
-
-(Summarize the bug encountered concisely)
-
-
-## Steps to reproduce
-
-(How one can reproduce the issue - this is very important)
-
-## What is the current bug behavior?
-
-(What actually happens)
-
-## What is the expected correct behavior?
-
-(What you should see instead)
-
-## Relevant logs and/or screenshots
-
-(Paste any relevant logs - use code blocks (```) to format console output, logs, and code, as
-it's very hard to read otherwise.)
-
-## Possible fixes
-
-(If you can, link to the line of code that might be responsible for the problem)
-
-/label ~Bug
-/label ~Reporter::
diff --git a/.gitlab/issue_templates/Default.md b/.gitlab/issue_templates/Default.md
deleted file mode 100644
index f84fbc2..0000000
--- a/.gitlab/issue_templates/Default.md
+++ /dev/null
@@ -1,36 +0,0 @@
-Quick description of this feature.
-
-/label ~Reporter::
-
-## 👤 User story
-
-“As a persona, I want_to, so_that.”
-
-<!--
-
-Breaking this down:
-
-"As a [persona]": Who are we building this for? We’re not just after a job title, we’re after the persona of the person. Max. Our team should have a shared understanding of who Max is. We’ve hopefully interviewed plenty of Max’s. We understand how that person works, how they think and what they feel. We have empathy for Max.
-“Wants to”: Here we’re describing their intent — not the features they use. What is it they’re actually trying to achieve? This statement should be implementation free — if you’re describing any part of the UI and not what the user goal is you're missing the point.
-“So that”: how does their immediate desire to do something this fit into their bigger picture? What’s the overall benefit they’re trying to achieve? What is the big problem that needs solving?
-For example, user stories might look like:
-
-As Max, I want to invite my friends, so we can enjoy this service together.
-As Sascha, I want to organize my work, so I can feel more in control.
-As a manager, I want to be able to understand my colleagues progress, so I can better report our sucess and failures.
-This structure is not required, but it is helpful for defining done. When that persona can capture their desired value, then the story is complete. We encourage teams to define their own structure, and then to stick to it.
-
-[resource](https://www.atlassian.com/agile/project-management/user-stories)
--->
-
-## ✔️ Acceptance criteria
-
-- [ ] 
-
-## ⚙️ Non-Funcional requirements
-
-- [ ] 
-
-## 🖼️ Design
-
-
diff --git a/.gitlab/merge_request_templates/Default.md b/.gitlab/merge_request_templates/Default.md
deleted file mode 100644
index 493f053..0000000
--- a/.gitlab/merge_request_templates/Default.md
+++ /dev/null
@@ -1,27 +0,0 @@
-<!-- Template is here to help you. Use whichever parts you want. -->
-<!-- Replace or delete content or parts of this template. -->
-
-Closes #n.
-
-Quick description of ticket & work.
-
-## 👉 Why?
-
-Description of why it's implemented how you've done it. E.g. what
-fremework was chosen and why, other technical decisions.
-
-## 👀 How?
-
-Technical explanation of how the improvement was achieved.
-
-## 🖥️ See
-
-|              🥚 Before               |             🐣 After                 |
-| :----------------------------------: | :----------------------------------: |
-|   replace_with_comment_or_delete    |   replace_with_comment_or_delete    |
-| paste_screenshot_of_main_branch_here | paste_screenshot_of_your_branch_here |
-
-## ⏰ TODOs
-
-- [ ] todo which the reviewer take look at
-- [ ] additional todo which has to be completed before merging
diff --git a/lib/ref_tree/src/node_mod/node_to_root_iterator.rs b/lib/ref_tree/src/node_mod/node_to_root_iterator.rs
index c167e86..fc5403e 100644
--- a/lib/ref_tree/src/node_mod/node_to_root_iterator.rs
+++ b/lib/ref_tree/src/node_mod/node_to_root_iterator.rs
@@ -17,9 +17,7 @@ impl<T> Iterator for NodeToRootIterator<T> {
 
     fn next(&mut self) -> Option<Self::Item> {
         // Finish if we're at the root.
-        let Some(current) = self.node.clone() else {
-            return None;
-        };
+        let current = self.node.clone()?;
 
         // Step up the tree.
         self.node = current
diff --git a/lib/ref_tree/src/tree_mod/tree.rs b/lib/ref_tree/src/tree_mod/tree.rs
index be01960..e216fe2 100644
--- a/lib/ref_tree/src/tree_mod/tree.rs
+++ b/lib/ref_tree/src/tree_mod/tree.rs
@@ -17,7 +17,7 @@ pub struct Tree<T> {
     /// Some -> Tree has at least one node.
     ///
     /// Arc - Multi-thread simultaneous access to the root node.
-    /// RwLock
+    /// `RwLock`
     /// - Ability to read from one thread, but write from others without blocking.
     /// - BE writes when adding size from nodes under root, FE reads with tick/whenever.
     /// - BE also reads when asking for children or going up the three.