private fun stringMatcherSelection(members: Collection<StringMatcherGenome>,
                                   target: String) : StringMatcherGenome {
    val totalFitness = members.sumBy { it.fitness(target) }
    val slicePoint = totalFitness * Randomness.value.nextDouble()

    var accumulator = 0
    members.forEach {
        if (accumulator >= slicePoint)
            return StringMatcherGenome(it.genes)
        accumulator += it.fitness(target)
    }

    return StringMatcherGenome(members.last().genes)
}