diff --git a/.gitignore b/.gitignore
index 9b57644..a090e06 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 venv/
 __pycache__/
 build/
-nut.egg-info/
\ No newline at end of file
+nut.egg-info/
+*.zip
+*.nut
\ No newline at end of file
diff --git a/nut/__init__.py b/nut/__init__.py
index 834f8f3..e69de29 100644
--- a/nut/__init__.py
+++ b/nut/__init__.py
@@ -1,3 +0,0 @@
-"""nut package."""
-
-__version__ = "0.1.0"
diff --git a/nut/__main__.py b/nut/__main__.py
index 7e659f2..c94b6d1 100644
--- a/nut/__main__.py
+++ b/nut/__main__.py
@@ -1,5 +1,5 @@
 import sys
-
+from .utils import zip_dir
 
 def main() -> int:
     for arg in sys.argv[1:]:
diff --git a/nut/builtins/base.py b/nut/builtins/base.py
new file mode 100644
index 0000000..b3bd262
--- /dev/null
+++ b/nut/builtins/base.py
@@ -0,0 +1,58 @@
+import sys
+
+class _Exit:
+    def __init__(self, code):
+        self.code = code
+
+class _Jump:
+    def __init__(self, target):
+        self.target = target
+
+
+class _Jmp(_Jump):
+    pass
+
+
+class _Call(_Jump):
+    RETURN = object()
+
+
+class _VM:
+    def __init__(self, entry, ctx=None):
+        self.current = entry
+        self.stack = []
+        self.ctx = ctx if ctx is not None else {}
+
+    def start(self):
+        while self.current is not None:
+            try:
+                self.loop()
+            except Exception as e:
+                print(f"Error: {e}")
+                sys.exit(1)
+                
+
+    def loop(self):
+        action = self.current(self.ctx)
+
+        if isinstance(action, _Jmp):
+            self.current = action.target
+            return
+
+        if isinstance(action, _Call):
+            self.stack.append(self.current)
+            self.current = action.target
+            return
+
+        if action is _Call.RETURN:
+            if not self.stack:
+                self.current = None
+                return
+            self.current = self.stack.pop()
+            return
+
+        if isinstance(action, _Exit):
+            sys.exit(action.code)
+
+        print(f"Unknown action: {action}")
+        sys.exit(1)
diff --git a/nut/utils.py b/nut/utils.py
new file mode 100644
index 0000000..b78565f
--- /dev/null
+++ b/nut/utils.py
@@ -0,0 +1,96 @@
+import os
+import zipfile
+import json
+import fnmatch
+
+
+def _should_ignore(rel_path, patterns):
+    """
+    Check if a file should be ignored based on patterns.
+    """
+    rel_path = rel_path.replace("\\", "/")
+
+    for pattern in patterns:
+        pattern = pattern.strip()
+
+        if not pattern:
+            continue
+
+        if pattern.endswith("/"):
+            if rel_path.startswith(pattern):
+                return True
+
+        if fnmatch.fnmatch(rel_path, pattern):
+            return True
+
+    return False
+
+
+def zip_dir(source_dir, output_zip_path, metadata=None, ignore_patterns=None):
+    """
+    Compress a directory into a zip file with ignore support.
+
+    :param source_dir: path to folder
+    :param output_zip_path: where to save zip
+    :param metadata: dict -> stored as _meta.json inside zip
+    :param ignore_patterns: list like gitignore ["*.log", "__pycache__/", "build/*"]
+    """
+    ignore_patterns = ignore_patterns or []
+
+    with zipfile.ZipFile(output_zip_path, 'w', zipfile.ZIP_DEFLATED) as zipf:
+        for root, dirs, files in os.walk(source_dir):
+
+            rel_root = os.path.relpath(root, source_dir).replace("\\", "/")
+
+            # filter dirs in-place (important for performance)
+            dirs[:] = [
+                d for d in dirs
+                if not _should_ignore(
+                    os.path.join(rel_root, d).replace("\\", "/"),
+                    ignore_patterns
+                )
+            ]
+
+            for file in files:
+                full_path = os.path.join(root, file)
+                rel_path = os.path.relpath(full_path, source_dir).replace("\\", "/")
+
+                if _should_ignore(rel_path, ignore_patterns):
+                    continue
+
+                zipf.write(full_path, rel_path)
+
+        if metadata:
+            zipf.writestr("_meta.json", json.dumps(metadata, indent=2))
+
+
+def unzip_to_dir(zip_path, output_dir):
+    """
+    Extract zip file to a directory.
+    """
+    with zipfile.ZipFile(zip_path, 'r') as zipf:
+        zipf.extractall(output_dir)
+
+
+def unzip_in_memory(zip_path):
+    """
+    Read zip contents into memory only.
+
+    :return: dict {filename: bytes}, metadata separately if exists
+    """
+    data = {}
+    metadata = None
+
+    with zipfile.ZipFile(zip_path, 'r') as zipf:
+        for name in zipf.namelist():
+            content = zipf.read(name)
+
+            if name == "_meta.json":
+                metadata = json.loads(content.decode())
+            else:
+                data[name] = content
+
+    return {
+        "files": data,
+        "metadata": metadata
+    }
\ No newline at end of file