diff --git a/bakara/src/bakara.hpp b/bakara/src/bakara.hpp
new file mode 100644
index 0000000..e69de29
diff --git a/bakara/src/bakara/test.cpp b/bakara/src/bakara/test.cpp
new file mode 100644
index 0000000..0610e22
--- /dev/null
+++ b/bakara/src/bakara/test.cpp
@@ -0,0 +1,6 @@
+#include "test.hpp"
+namespace BK::Math {
+    int add(int x, int y) {
+        return x + y;
+    }
+}
diff --git a/bakara/src/bakara/test.hpp b/bakara/src/bakara/test.hpp
new file mode 100644
index 0000000..c6b9f57
--- /dev/null
+++ b/bakara/src/bakara/test.hpp
@@ -0,0 +1,6 @@
+#ifndef TEST_H
+#define TEST_H
+namespace BK::Math {
+    int add(int x, int y);
+}
+#endif
\ No newline at end of file
diff --git a/sandbox/src/main.cpp b/sandbox/src/main.cpp
index e69de29..f6c9881 100644
--- a/sandbox/src/main.cpp
+++ b/sandbox/src/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+#include <bakara/test.hpp>
+
+int main() {
+    std::cout << BK::Math::add(2, 2) << "\n";
+}
\ No newline at end of file