refactor: reorganize directory structure

assignment1/default.nix

@@ -0,0 +1,22 @@
+let
+  basic-c = name: { stdenv }:
+    stdenv.mkDerivation {
+      inherit name;
+      src = ./.;
+      buildPhase = ''
+        runHook preBuild
+        gcc part2/${name}.c -o ${name}
+        runHook postBuild
+      '';
+      installPhase = ''
+        runHook preInstall
+        mkdir -p $out/bin
+        install ${name} $out/bin/
+        runHook postInstall
+      '';
+    };
+in {
+  a1-hello = basic-c "hello";
+  a1-employee = basic-c "employee";
+  a1-logwriter = basic-c "logwriter";
+}