from typing import Dict

def health_check() -> Dict[str, str]:
    """
    Health check function to check if the service is running.

    Returns:
        A dictionary with a 'status' key indicating the service status.
    """
    return {"status": "OK"}

def is_service_healthy(response: Dict[str, str]) -> bool:
    """
    Check if the service is healthy based on the health check response.

    Args:
        response: The response dictionary from the health check.

    Returns:
        True if the service is healthy, False otherwise.
    """
    return response.get("status") == "OK"

def get_service_status() -> str:
    """
    Get the service status as a string.

    Returns:
        A string representing the service status.
    """
    response = health_check()
    if is_service_healthy(response):
        return "Service is running"
    else:
        return "Service is not running"

def format_health_check_response(response: Dict[str, str]) -> str:
    """
    Format the health check response as a string.

    Args:
        response: The response dictionary from the health check.

    Returns:
        A formatted string representing the health check response.
    """
    status = response.get("status", "Unknown")
    return f"Service status: {status}"