Just another update

Task/Fibonacci-sequence/Go/fibonacci-sequence-3.go

@@ -0,0 +1,16 @@
+func fibNumber() func() int {
+	fib1, fib2 := 0, 1
+	return func() int {
+		fib1, fib2 = fib2, fib1 + fib2
+		return fib1
+	}
+}
+
+func fibSequence(n int) int {
+	f := fibNumber()
+	fib := 0
+	for i := 0; i < n; i++ {
+		fib = f()
+	}
+	return fib
+}