style: format markdown files with remark-lint

```cpp

struct Range {

  int start, end;

    Range(int s = 0, int e = 0) {

        start = s, end = e;

    }

  Range(int s = 0, int e = 0) { start = s, end = e; }

};

template <typename T>

void quick_sort(T arr[], const int len) {

    if (len <= 0)

        return; // 避免 len 等于负值时宣告堆叠阵列宕机

  if (len <= 0) return;  // 避免 len 等于负值时宣告堆叠阵列宕机

  // r[]模拟堆叠，p为数量,r[p++]为push,r[--p]为pop且取得元素

  Range r[len];

  int p = 0;

  r[p++] = Range(0, len - 1);

  while (p) {

    Range range = r[--p];

        if (range.start >= range.end)

            continue;

    if (range.start >= range.end) continue;

    T mid = arr[range.end];

    int left = range.start, right = range.end - 1;

    while (left < right) {