from .symbols import MORSE_SYMBOL_TO_LETTER, InvalidSymbolError def append_morse_symbol(message: str, symbol: str) -> str: """ Decodes a Morse code symbol and appends the corresponding character to the message. Args: message (str): current message string being built. symbol (str): morse code symbol to be translated (e.g., ".-", ".----", "del"). Returns: str: The updated message with the translated symbol appended, or with the last character removed if the symbol is "del". Raises: InvalidSymbolError: If the symbol is not a valid Morse code character. """ raise InvalidSymbolError() def translate_message(morse: str) -> str: """ Translates a Morse code message into an English string. Args: morse (str): A series of Morse code symbols separated by "/". Each symbol can represent a letter, number, or space. Returns: str: The translated English message. If any invalid symbols are encountered, they are ignored. If the last potential symbol is not valid, it is appended as is (i.e., as dots and dashes). """ ...