def process_all_dictionary_keys(dictionary, function):
    """
    Function that applies a function or a list of functions to every single key in a dictionary
    """
    _dictionary = {}
    for k, v in dictionary.items():
        if isinstance(function, list):
            for f in function:
                _dictionary[f(k)] = v
        else:
            _dictionary[function(k)] = v
    return _dictionary