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）。
return response.ok; // Body is never consumed or cancelled
，这一点在safew官方版本下载中也有详细论述
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Consider some of the more obscure tests that implementations must pass:
Clean living conditions that lessen exposure to microorganisms are linked to an increase in allergies. Mouse data reveal how the environment affects allergic immune responses.