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p132 字符串旋转

char *transform(char *str, int number) {
    char *head = str;
    char *current = str;
    int len = strlen(str);
    for (int i = 0; i < len; ++i) {
        current++;
    }
    for (int i = 0; i < number; ++i) {
        *current++ = *head++;
    }
    *current = '\0';
    return head;
}