Commit919331c

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Merge pull requestneetcode-gh#1605 from t3chkid/main

Adds solutions for problems 17 & 51 in Kotlin

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	`1`	`+packagekotlin`
	`2`	`+`
	`3`	`+classSolution {`
	`4`	`+funletterCombinations(digits:String):List<String> {`
	`5`	`+if (digits.isEmpty())return emptyList()`
	`6`	`+val resultantList= mutableListOf<String>()`
	`7`	`+val stringBuilder=StringBuilder()`
	`8`	`+val digitCharListMapping=mutableMapOf(`
	`9`	`+'2' tolistOf('a','b','c'),`
	`10`	`+'3' tolistOf('d','e','f'),`
	`11`	`+'4' tolistOf('g','h','i'),`
	`12`	`+'5' tolistOf('j','k','l'),`
	`13`	`+'6' tolistOf('m','n','o'),`
	`14`	`+'7' tolistOf('p','q','r','s'),`
	`15`	`+'8' tolistOf('t','u','v'),`
	`16`	`+'9' tolistOf('w','x','y','z')`
	`17`	`+ )`
	`18`	`+`
	`19`	`+fundfs(decisionIndex:Int = 0) {`
	`20`	`+if (stringBuilder.length== digits.length) {`
	`21`	`+ resultantList.add(stringBuilder.toString())`
	`22`	`+return`
	`23`	`+ }`
	`24`	`+val charListForDigitAtDecisionIndex= digitCharListMapping.getValue(digits[decisionIndex])`
	`25`	`+for (charin charListForDigitAtDecisionIndex) {`
	`26`	`+ stringBuilder.append(char)`
	`27`	`+ dfs(decisionIndex+1)`
	`28`	`+ stringBuilder.deleteCharAt(stringBuilder.lastIndex)`
	`29`	`+ }`
	`30`	`+ }`
	`31`	`+ dfs()`
	`32`	`+return resultantList`
	`33`	`+ }`
	`34`	`+}`

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