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fix: Improve factorial implementation with input validation and base case optimization

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Original file line number	Diff line number	Diff line change
`@@ -144,7 +144,10 @@ console.log(fibonacci(6)); // Output: 8`
`144`	`144`
`145`	`145`	```js
`146`	`146`	`function factorial(n) {`
`147`		`- if (n === 0) return 1;`
	`147`	`+ if (n < 0) throw new RangeError('Factorial is not defined for negative numbers');`
	`148`	`+`
	`149`	`+ if (n === 0 \|\| n === 1) return 1;`
	`150`	`+`
`148`	`151`	`return n * factorial(n - 1);`
`149`	`152`	`}`
`150`	`153`

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