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let stepIncreaser = MorningWalk.addSteps(_:)
let stepDecreaser = MorningWalk.minusSteps(_:)

stepIncreaser(sundayMorningWalk)(200) // Now 'steps' becomes 300
stepDecreaser(sundayMorningWalk)(50) // Now 'steps' becomes 250
print(sundayMorningWalk.steps) //It prints 250