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Create: 0217-encode-and-decode-strings.kt

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	`1`	`+classCodec {`
	`2`	`+// Encodes a list of strings to a single string.`
	`3`	`+funencode(strs:List<String>):String {`
	`4`	`+var res=""`
	`5`	`+ strs.forEach{`
	`6`	`+ res= res+ it.length+"#"+ it`
	`7`	`+ }`
	`8`	`+return res`
	`9`	`+ }`
	`10`	`+`
	`11`	`+// Decodes a single string to a list of strings.`
	`12`	`+fundecode(s:String):List<String> {`
	`13`	`+var (res, i)=Pair(mutableListOf<String>(),0)`
	`14`	`+`
	`15`	`+while (i< s.length){`
	`16`	`+var j= i`
	`17`	`+while (s[j]!='#') {`
	`18`	`+ j++`
	`19`	`+ }`
	`20`	`+val lengthOfWord= s.subSequence(i, j).toString().toInt()`
	`21`	`+`
	`22`	`+val (wordStart, wordEnd)=Pair(j+1, j+1+lengthOfWord)`
	`23`	`+ res.add(s.subSequence(wordStart, wordEnd).toString())`
	`24`	`+`
	`25`	`+ i= wordEnd`
	`26`	`+`
	`27`	`+ }`
	`28`	`+return res`
	`29`	`+`
	`30`	`+ }`
	`31`	`+}`
	`32`	`+`
	`33`	`+/**`
	`34`	`+ * Your Codec object will be instantiated and called as such:`
	`35`	`+ * var obj = Codec()`
	`36`	`+ * val s = obj.encode(strs)`
	`37`	`+ * val ans = obj.decode(s)`
	`38`	`+*/`

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