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Create 1721swapping-nodes-in-a-linked-list.kt

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	`1`	`+/**`
	`2`	`+ * Example:`
	`3`	`+ * var li = ListNode(5)`
	`4`	+ * var v = li.`val`
	`5`	`+ * Definition for singly-linked list.`
	`6`	+ * class ListNode(var `val`: Int) {
	`7`	`+ * var next: ListNode? = null`
	`8`	`+ * }`
	`9`	`+*/`
	`10`	`+classSolution {`
	`11`	`+funswapNodes(head:ListNode?,k:Int):ListNode? {`
	`12`	`+var cur= head`
	`13`	`+ repeat(k-1) { cur= cur?.next }`
	`14`	`+`
	`15`	`+var left= cur`
	`16`	`+`
	`17`	`+var right= head`
	`18`	`+while (cur?.next!=null) {`
	`19`	`+ cur= cur?.next`
	`20`	`+ right= right?.next`
	`21`	`+ }`
	`22`	`+`
	`23`	+ left?.`val`= right?.`val`.also { right?.`val`= left?.`val` }
	`24`	`+return head`
	`25`	`+ }`
	`26`	`+`
	`27`	`+}`

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