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修改(0024.两两交换链表中的节点.md):优化typescript版本代码,增强易读性

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Original file line number	Diff line number	Diff line change
`@@ -254,20 +254,19 @@ TypeScript:`
`254`	`254`
`255`	`255`	```typescript
`256`	`256`	`function swapPairs(head: ListNode \| null): ListNode \| null {`
`257`		`- const dummyHead: ListNode = new ListNode(0, head);`
`258`		`- let cur: ListNode = dummyHead;`
`259`		`- while(cur.next !== null && cur.next.next !== null) {`
`260`		`- const tem: ListNode = cur.next;`
`261`		`- const tem1: ListNode = cur.next.next.next;`
`262`		`-`
`263`		`- cur.next = cur.next.next; // step 1`
`264`		`- cur.next.next = tem; // step 2`
`265`		`- cur.next.next.next = tem1; // step 3`
`266`		`-`
`267`		`- cur = cur.next.next;`
`268`		`- }`
`269`		`- return dummyHead.next;`
`270`		`-}`
	`257`	`+ const dummyNode: ListNode = new ListNode(0, head);`
	`258`	`+ let curNode: ListNode \| null = dummyNode;`
	`259`	`+ while (curNode && curNode.next && curNode.next.next) {`
	`260`	`+ let firstNode: ListNode = curNode.next,`
	`261`	`+ secNode: ListNode = curNode.next.next,`
	`262`	`+ thirdNode: ListNode \| null = curNode.next.next.next;`
	`263`	`+ curNode.next = secNode;`
	`264`	`+ secNode.next = firstNode;`
	`265`	`+ firstNode.next = thirdNode;`
	`266`	`+ curNode = firstNode;`
	`267`	`+ }`
	`268`	`+ return dummyNode.next;`
	`269`	`+};`
`271`	`270`	```
`272`	`271`
`273`	`272`	`Kotlin:`

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