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feat: add swift implementation to lcof2 problem: No.023 (#3011)

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	`1`	`+/**`
	`2`	`+ * Definition for singly-linked list.`
	`3`	`+ * public class ListNode {`
	`4`	`+ * public var val: Int`
	`5`	`+ * public var next: ListNode?`
	`6`	`+ * public init(_ val: Int) {`
	`7`	`+ * self.val = val`
	`8`	`+ * self.next = nil`
	`9`	`+ * }`
	`10`	`+ * }`
	`11`	`+ */`
	`12`	`+`
	`13`	`+class Solution {`
	`14`	`+ func getIntersectionNode(_ headA: ListNode?, _ headB: ListNode?) -> ListNode? {`
	`15`	`+ var a = headA`
	`16`	`+ var b = headB`
	`17`	`+ while a !== b {`
	`18`	`+ a = a == nil ? headB : a?.next`
	`19`	`+ b = b == nil ? headA : b?.next`
	`20`	`+ }`
	`21`	`+ return a`
	`22`	`+ }`
	`23`	`+}`

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