remove unused function

        with open(self.failedCmdsFile, "r") as f:

            return sum(1 for line in f if line.strip())

    def getFailedCommandsRange(self, start: int, end: int) -> list[str]:

        if not os.path.exists(self.failedCmdsFile) or end <= start:

            return []

        with open(self.failedCmdsFile, "r") as f:

            lines = [line.strip() for line in f if line.strip()]

        return lines[start:end]

    def appendRunlog(self, command: str = "", output: str = "", context: str = "") -> None:

        if not getattr(self, "logFile", None):

            return