import html
import json
import re


def compact_data(data: dict) -> str:
    """
    Removes keys with empty values (None, "", [], {}) from a dictionary
    and returns a compact JSON string without unnecessary spaces.

    Args:
        data(dict): Original dictionary.
    Returns:
        str: Compact JSON representation of the filtered dictionary.
    """
    data = {k: v for k, v in data.items() if v not in (None, "", [], {})}
    return json.dumps(data, separators=(",", ":"))

def clear_text(text: str) -> str:
    """
    Cleans text by removing HTML tags, Markdown links,
    decoding HTML characters, removing escaped quotes, and
    normalizing spaces.

    Args:
        text (str): Original text.
    Returns:
        str: Cleaned and simplified text.
    """
    if not text:
        return ""

    # Remove HTML tags
    text = re.sub(r'<[^>]+>', '', text)

    # Replace Markdown links [Text](URLxt
    text = re.sub(r'\[([^\]]+)\]\([^)]+\)', r'\1', text)

    # Decode HTML characters (&nbsp;, &lt;, etc.)
    text = html.unescape(text)

    # Remove escaped quotes
    text = text.replace('\\"', '"').replace("\\'", "'")

    # Remove line breaks, tabs, and multiple spaces
    text = re.sub(r'\s+', ' ', text).strip()

    return text
