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CodeWars/7kyu/complementary_dna/solution.kt

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Kotlin
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package dna
fun makeComplement(dna : String) : String = dna.map { it ->
when (it) {
'A' -> 'T'
'T' -> 'A'
'C' -> 'G'
'G' -> 'C'
else -> it
}
}.joinToString("")