diff --git a/src/utils/__init__.py b/src/utils/__init__.py
new file mode 100644
index 0000000..5353844
--- /dev/null
+++ b/src/utils/__init__.py
@@ -0,0 +1,70 @@
+"""Utility functions for file handling and output."""
+
+from pathlib import Path
+from typing import Optional
+
+
+def get_file_language(file_path: Path) -> Optional[str]:
+    """Determine programming language from file extension."""
+    extension_map = {
+        ".py": "python",
+        ".js": "javascript",
+        ".ts": "typescript",
+        ".jsx": "javascript",
+        ".tsx": "typescript",
+    }
+    return extension_map.get(file_path.suffix.lower())
+
+
+def is_supported_file(file_path: Path) -> bool:
+    """Check if file is supported for analysis."""
+    return get_file_language(file_path) is not None
+
+
+def read_source_file(file_path: Path) -> Optional[str]:
+    """Read source file contents."""
+    try:
+        return file_path.read_text(encoding="utf-8")
+    except (UnicodeDecodeError, FileNotFoundError):
+        return None
+
+
+def write_source_file(file_path: Path, content: str) -> bool:
+    """Write source file contents."""
+    try:
+        file_path.write_text(content, encoding="utf-8")
+        return True
+    except (UnicodeDecodeError, FileNotFoundError, PermissionError):
+        return False
+
+
+def create_backup(file_path: Path) -> Optional[Path]:
+    """Create a backup of the file."""
+    try:
+        backup_path = file_path.with_suffix(file_path.suffix + ".bak")
+        backup_path.write_text(file_path.read_text(encoding="utf-8"), encoding="utf-8")
+        return backup_path
+    except (FileNotFoundError, PermissionError):
+        return None
+
+
+def remove_backup(file_path: Path) -> bool:
+    """Remove a backup file."""
+    try:
+        backup_path = file_path.with_suffix(file_path.suffix + ".bak")
+        if backup_path.exists():
+            backup_path.unlink()
+        return True
+    except (FileNotFoundError, PermissionError):
+        return False
+
+
+def count_lines_of_code(source_code: str) -> int:
+    """Count lines of code (excluding empty lines and comments)."""
+    lines = source_code.split("\n")
+    code_lines = 0
+    for line in lines:
+        stripped = line.strip()
+        if stripped and not stripped.startswith("#"):
+            code_lines += 1
+    return code_lines