feat(core): split library layout and add tests

.gitea/workflows/build.yml

@@ -0,0 +1,43 @@
+name: Build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  linux-build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install build tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential
+
+      - name: Build demo
+        run: |
+          mkdir -p demo/build
+          gcc -std=c11 -Wall -Wextra -pedantic \
+            -Iinclude \
+            demo/main.c \
+            src/ikv.c \
+            src/loaders/ikv1.c \
+            src/loaders/ikv2.c \
+            -o demo/build/ikv_demo
+
+      - name: Build unit tests
+        run: |
+          mkdir -p demo/build
+          gcc -std=c11 -Wall -Wextra -pedantic \
+            -Iinclude \
+            demo/unit_test.c \
+            src/ikv.c \
+            src/loaders/ikv1.c \
+            src/loaders/ikv2.c \
+            -o demo/build/ikv_tests
+
+      - name: Run unit tests
+        run: ./demo/build/ikv_tests