fix: resolve build error for commit 5eae708 (#318)

codes/swift/chapter_stack_and_queue/array_queue.swift

@@ -38,10 +38,10 @@ class ArrayQueue {
         }
         // 计算尾指针，指向队尾索引 + 1
         // 通过取余操作，实现 rear 越过数组尾部后回到头部
-        int rear = (front + queSize) % capacity();
+        let rear = (front + queSize) % capacity()
         // 尾结点后添加 num
-        nums[rear] = num;
-        queSize++;
+        nums[rear] = num
+        queSize += 1
     }
 
     /* 出队 */
@@ -49,9 +49,9 @@ class ArrayQueue {
     func poll() -> Int {
         let num = peek()
         // 队首指针向后移动一位，若越过尾部则返回到数组头部
-        front = (front + 1) % capacity();
-        queSize--;
-        return num;
+        front = (front + 1) % capacity()
+        queSize -= 1
+        return num
     }
 
     /* 访问队首元素 */
@@ -66,7 +66,7 @@ class ArrayQueue {
     func toArray() -> [Int] {
         // 仅转换有效长度范围内的列表元素
         var res = Array(repeating: 0, count: queSize)
-        for (i, j) in sequence(first: (0, front), next: { $0 < queSize - 1 ? ($0 + 1, $1 + 1) : nil }) {
+        for (i, j) in sequence(first: (0, front), next: { $0 < self.queSize - 1 ? ($0 + 1, $1 + 1) : nil }) {
             res[i] = nums[j % capacity()]
         }
         return res