Commit 79d82cf

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Add Solution2.go for 0021.Merge Two Sorted Lists

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Original file line number	Diff line number	Diff line change
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	`1`	`+func mergeTwoLists(l1 ListNode, l2 ListNode) *ListNode {`
	`2`	`+ if l1 == nil {`
	`3`	`+ return l2`
	`4`	`+ }`
	`5`	`+ if l2 == nil {`
	`6`	`+ return l1`
	`7`	`+ }`
	`8`	`+ if l1.Val < l2.Val {`
	`9`	`+ l1.Next = mergeTwoLists(l1.Next, l2)`
	`10`	`+ return l1`
	`11`	`+ } else {`
	`12`	`+ l2.Next = mergeTwoLists(l1, l2.Next)`
	`13`	`+ return l2`
	`14`	`+ }`
	`15`	`+}`

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