描述：给定字符串 num（非负整数）和整数 k，移除 k 位数字，使剩余数字最小。以字符串形式返回（不含前导零）。
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This aggressive approach by Apple has led F1 CEO Stefano Domenicali to say that the sport will become bigger than it ever was while airing on ESPN. "It will allow us to enter in the houses of other people in a different way, in great quality that is very important for us. So, that is what I believe the Apple relationship will bring to us in the American market," he told Racer.