from typing import Dict


def sanitize_prop_dict_keys(dct: Dict[str, str]) -> Dict[str, str]:
    """
    Sanitizes all the keys in a dictionary (i.e. strips white space and makes lower case).

    Args:
        dct: The dictionary.

    Returns: The dictionary with sanitized keys.

    """
    return {k.strip().lower(): v for k, v in dct.items()}