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Create 0389-find-the-difference.kt

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	`1`	`+// same as below, but using xor`
	`2`	`+classSolution {`
	`3`	`+funfindTheDifference(s:String,t:String):Char {`
	`4`	`+var res=0`
	`5`	`+for (cin s) res= res xor c.toInt()`
	`6`	`+for (cin t) res= res xor c.toInt()`
	`7`	`+return res.toChar()`
	`8`	`+ }`
	`9`	`+}`
	`10`	`+`
	`11`	`+// using sums difference`
	`12`	`+classSolution {`
	`13`	`+funfindTheDifference(s:String,t:String):Char {`
	`14`	`+var sum=0`
	`15`	`+for (cin t) sum+= c.toInt()`
	`16`	`+for (cin s) sum-= c.toInt()`
	`17`	`+return sum.toChar()`
	`18`	`+ }`
	`19`	`+}`

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