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feat(dsa): solve remove duplicates from sorted array using two-pointer approach

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Original file line number	Diff line number	Diff line change
`@@ -78,3 +78,14 @@ function reverse(i, j) {`
`78`	`78`	`j--;`
`79`	`79`	`}`
`80`	`80`	`}`
	`81`	`+`
	`82`	`+// Remove duplicates from sorted array using two pointers algorithm`
	`83`	`+let nums1 = [1, 1, 2, 2, 3, 4, 4];`
	`84`	`+let j1 = 1;`
	`85`	`+for (let i = 0; i < nums1.length - 1; i++) {`
	`86`	`+ if (nums1[i] != nums1[i + 1]) {`
	`87`	`+ nums1[j] = nums1[i + 1];`
	`88`	`+ j1++;`
	`89`	`+ }`
	`90`	`+}`
	`91`	`+return j1;`

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