diff --git a/.copier-answers.yml b/.copier-answers.yml
index bcbd320..5cf16cd 100644
--- a/.copier-answers.yml
+++ b/.copier-answers.yml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: v1.7.2
+_commit: v1.7.3
 _src_path: https://github.com/DeveloperC286/template
 project_name: monkey_interpreter
 project_type: rust
diff --git a/.github/workflows/continuous-delivery.yml b/.github/workflows/continuous-delivery.yml
index 0a8bdbc..b124bf8 100644
--- a/.github/workflows/continuous-delivery.yml
+++ b/.github/workflows/continuous-delivery.yml
@@ -18,7 +18,7 @@ jobs:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Publish binary.
@@ -26,6 +26,22 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by GitHub Actions.
 
+<<<<<<< before updating
+=======
+  publish-crate:
+    name: Publish Crate
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout code.
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Setup Nix.
+        uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
+      - name: Publish crate.
+        run: nix develop -c make publish-crate
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+
+>>>>>>> after updating
   publish-docker-image:
     name: Publish Docker Image (${{ matrix.platform }})
     runs-on: ${{ matrix.runner }}
@@ -43,11 +59,11 @@ jobs:
             suffix: arm64
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3.7.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -63,11 +79,11 @@ jobs:
     needs: [publish-docker-image]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3.7.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index ec3687c..4f8f26e 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -15,7 +15,7 @@ jobs:
         language: [shell]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Check permissions.
         run: make check-${{ matrix.language }}-permissions
 
@@ -28,7 +28,7 @@ jobs:
         language: [rust, shell]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Check formatting.
@@ -43,7 +43,7 @@ jobs:
         language: [rust, shell]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Check linting.
@@ -58,7 +58,7 @@ jobs:
         language: [rust]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Check dependencies.
@@ -72,7 +72,7 @@ jobs:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Compile.
@@ -86,8 +86,25 @@ jobs:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Unit test.
         run: nix develop -c make unit-test
+<<<<<<< before updating
+=======
+
+  end-to-end-test:
+    name: End to End Test
+    runs-on: ${{ matrix.architecture }}
+    strategy:
+      matrix:
+        architecture: [ubuntu-24.04, ubuntu-24.04-arm]
+    steps:
+      - name: Checkout code.
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Setup Nix.
+        uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
+      - name: End to End test.
+        run: nix develop -c make end-to-end-test
+>>>>>>> after updating
diff --git a/.github/workflows/conventional-commits.yml b/.github/workflows/conventional-commits.yml
index 358f390..4906890 100644
--- a/.github/workflows/conventional-commits.yml
+++ b/.github/workflows/conventional-commits.yml
@@ -15,7 +15,7 @@ jobs:
       image: ghcr.io/developerc286/conventional_commits_linter:0.17.1@sha256:f1b947937ee884ba7f886d04939cd4858f9aeafb50dcf94925a516c50e43021b
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
diff --git a/.github/workflows/git-history.yml b/.github/workflows/git-history.yml
index 1b18abe..e08fafb 100644
--- a/.github/workflows/git-history.yml
+++ b/.github/workflows/git-history.yml
@@ -13,7 +13,7 @@ jobs:
       image: ghcr.io/developerc286/clean_git_history:1.1.6@sha256:93fd9c692f6e629956921b8d068ccad33760882b6e0c6d4d32cd963380aec25f
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
diff --git a/.github/workflows/github-actions-workflows.yml b/.github/workflows/github-actions-workflows.yml
index 31d7778..1d4dad0 100644
--- a/.github/workflows/github-actions-workflows.yml
+++ b/.github/workflows/github-actions-workflows.yml
@@ -14,7 +14,7 @@ jobs:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Check formatting.
@@ -28,7 +28,7 @@ jobs:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
     steps:
       - name: Checkout code.
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Setup Nix.
         uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - name: Check GitHub Actions workflows linting.