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Create caesarscipher.js

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	`1`	`+function rot13(str) {`
	`2`	`+ const alphabets = "NOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ"`
	`3`	`+`
	`4`	`+ return str.split("").map((letter) => {`
	`5`	`+ const index = alphabets.lastIndexOf(letter)`
	`6`	`+ if (index === -1){`
	`7`	`+ return letter`
	`8`	`+ }`
	`9`	`+ return alphabets[index-13]`
	`10`	`+ }).join("")`
	`11`	`+}`
	`12`	`+`
	`13`	`+rot13("SERR PBQR PNZC");`

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