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Solve: altPairs

Imported By: Geoffrey Challen
/ Version: 2021.5.0

Given a String, return a String made of the chars at indexes 0,1, 4,5, 8,9, and so on. So "kittens" yields "kien".

fun altPairs(input: String): String {
return "" // You may need to remove this starter code
}

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