Commit 7f0d69b

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adding insertAt method

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Original file line number	Diff line number	Diff line change
`@@ -117,5 +117,21 @@ class LinkedList {`
`117`	`117`	`}`
`118`	`118`	`previous.next = previous.next.next;`
`119`	`119`	`}`
	`120`	`+`
	`121`	`+ insertAt(data, index) {`
	`122`	`+ if(!this.head) {`
	`123`	`+ this.head = new Node(data);`
	`124`	`+ return;`
	`125`	`+ }`
	`126`	`+`
	`127`	`+ if(index === 0) {`
	`128`	`+ this.head = new Node(data, this.head);`
	`129`	`+ return;`
	`130`	`+ }`
	`131`	`+`
	`132`	`+ const previous = this.getAt(index-1) \|\| this.getLast();`
	`133`	`+ const node = new Node(data, previous.next);`
	`134`	`+ previous.next = node;`
	`135`	`+ }`
`120`	`136`	`}`
`121`	`137`

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