class CommandCenter:
    def __init__(self, default_input_type, default_function=None, all_commands=None):
        self.commands = {}
        self.add_command("/default", default_input_type, default_function)
        if all_commands:
            for command, input_type, function in all_commands:
                self.add_command(command, input_type, function)

    def add_command(self, command, input_type, function=None):
        assert input_type in [None, str, int, float, bool, list], "Invalid input type"
        self.commands[command] = {"input_type": input_type, "function": function}

    def parse_command(self, input_string):
        # parsing the input string
        if not input_string.startswith("/"):
            command = "/default"
            argument = input_string.split(" ")
        else:
            inputs = input_string.split(" ")
            command = inputs[0]
            argument = inputs[1:]

        # type casting the arguments
        if self.commands[command]["input_type"] == str:
            argument = " ".join(argument)
        elif self.commands[command]["input_type"] == int:
            argument = int(" ".join(argument))
        elif self.commands[command]["input_type"] == float:
            argument = float(" ".join(argument))
        elif self.commands[command]["input_type"] == bool:
            argument = bool(" ".join(argument))
        elif self.commands[command]["input_type"] == list:
            argument = argument
        else:
            argument = None

        return command, argument

    def execute_command(self, input_string):
        command, argument = self.parse_command(input_string)
        if command in self.commands:
            return self.commands[command]["function"](argument)
        else:
            return "Invalid command"