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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).
"""
return None