diff --git a/.github/workflows/dispatch-matrix-combo.yml b/.github/workflows/dispatch-matrix-combo.yml
index 6ef18f0..043c7cb 100644
--- a/.github/workflows/dispatch-matrix-combo.yml
+++ b/.github/workflows/dispatch-matrix-combo.yml
@@ -36,8 +36,6 @@ jobs:
           else
             echo "env=production" >> $GITHUB_OUTPUT
           fi
-
-          echo $set-env
   setup:
     runs-on: ubuntu-latest
     needs: pre
diff --git a/.github/workflows/lvl-3.yml b/.github/workflows/lvl-3.yml
index 3358ee0..19b1a47 100644
--- a/.github/workflows/lvl-3.yml
+++ b/.github/workflows/lvl-3.yml
@@ -15,8 +15,9 @@ jobs:
     needs: job-one
 
     steps:
-      - run: echo "Step-1 is completed",
-             echo "step-2 is running"
+      - run: |
+          echo "step-1 is completed"
+          echo "step-2 is running"
 
   job-three:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/lvl-4.yml b/.github/workflows/lvl-4.yml
index 94d2c87..b2c0b5f 100644
--- a/.github/workflows/lvl-4.yml
+++ b/.github/workflows/lvl-4.yml
@@ -9,5 +9,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - run: echo "Hello"
-             echo " world"
+      - run: |
+          echo "Hello"
+          echo " world"
diff --git a/.github/workflows/matrix-issue.yml b/.github/workflows/matrix-issue.yml
index 6f8a933..336f699 100644
--- a/.github/workflows/matrix-issue.yml
+++ b/.github/workflows/matrix-issue.yml
@@ -23,7 +23,7 @@ jobs:
       - setup
     strategy:
       matrix: ${{ fromJSON(needs.setup.outputs.matrix) }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     steps:
       - id: step1
         name: Pretend we are doing something
diff --git a/.github/workflows/task-3.yml b/.github/workflows/task-3.yml
index e275ca6..ccccdcb 100644
--- a/.github/workflows/task-3.yml
+++ b/.github/workflows/task-3.yml
@@ -20,7 +20,7 @@ jobs:
       - name: cache node modules
         uses: actions/cache@v4
         with:
-          path: /.npm
+          path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json')}}
           restore-keys: |
             ${{ runner.os }}-node
@@ -35,4 +35,4 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: build-output
-          path: /dist
+          path: dist
diff --git a/.github/workflows/test-python.yml b/.github/workflows/test-python.yml
index 443ef8e..14937e2 100644
--- a/.github/workflows/test-python.yml
+++ b/.github/workflows/test-python.yml
@@ -19,15 +19,12 @@ jobs:
         uses: actions/setup-python@v5
         with: 
           python-version: '3.10'
+          cache: 'pip'
 
       - name: Install dependencies
-        run: |
-          pip install -r requirements.txt
+        run: pip install -r requirements.txt
         
       - name: Run tests with pytest
-        run: |
-          echo "====== Start running tests ======"
-          pytest tests/calculator_tests.py
-          echo "===== Finish running tests ======"
+        run: pytest tests/calculator_tests.py
 
       
diff --git a/requirements.txt b/requirements.txt
index 107957b..55b033e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1 @@
-pytest
-numpy
\ No newline at end of file
+pytest
\ No newline at end of file
diff --git a/src/calculator.py b/src/calculator.py
index 5ac5372..1a69b98 100644
--- a/src/calculator.py
+++ b/src/calculator.py
@@ -1,5 +1,3 @@
-import numpy as np
-
 def add(a, b):
     """Returns the sum of a and b."""
     return a + b