2. 补全程序题 (5 空, 每空 2 分, 共 10 分)

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C 风格数组, 指针

有一句英文, 补全函数, 将句子中的数字替换为对应的英文单词. (譬如: There are 3 students in the room. 变为 There are three students in the room.).