diff --git a/.gitea/workflows/test1.yaml b/.gitea/workflows/test1.yaml
index 12f9275..29abfd3 100644
--- a/.gitea/workflows/test1.yaml
+++ b/.gitea/workflows/test1.yaml
@@ -1,17 +1,14 @@
-name: Gitea Actions Demo
-run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
+name: Build
+run-name: build
 on: [push]
 
 jobs:
-  Explore-Gitea-Actions:
+  build:
     runs-on: debian-latest
     steps:
-      - run: echo "🎉 The job was automatically triggered by a ${{ gitea.event_name }} event."
-      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by Gitea!"
-      - run: echo "🔎 The name of your branch is ${{ gitea.ref }} and your repository is ${{ gitea.repository }}."
-      - run: echo "💡 The ${{ gitea.repository }} repository has been cloned to the runner."
-      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
-      - name: List files in the repository
-        run: |
-          ls ${{ gitea.workspace }}
-      - run: echo "🍏 This job's status is ${{ job.status }}."
+      - name: Build funtions
+        run: gcc -c f.c
+      - name: Build core
+        run: gcc -c core.c
+      - name: Link program
+        run: gcc f.o core.o -o core
diff --git a/core.c b/core.c
new file mode 100644
index 0000000..c90a520
--- /dev/null
+++ b/core.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int f(int c, int d);
+
+int
+main(int argc, char **argv)
+{
+	int x, y;
+	sscanf(argv[1], "%d", &x);
+	sscanf(argv[2], "%d", &y);
+
+	int res = f(x, y);
+
+	printf("res = %d\n", res);
+
+	return 0;
+}
diff --git a/f.c b/f.c
new file mode 100644
index 0000000..5fea189
--- /dev/null
+++ b/f.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int
+f(int c, int d)
+{
+	int sum = d+c
+	printf("data %d+%d=%d\n", c, d, sum);
+	return sum;
+}