cleanup

main.go

@@ -15,9 +15,9 @@ func MaxValue(capacity uint, books []Book) uint {
 		return 0
 	}
 
-	book := books[0]
-	withBook := book.Value + MaxValue(capacity-book.Weight, books[1:])
-	withoutBook := MaxValue(capacity, books[1:])
+	book, rest := books[0], books[1:]
+	withBook := book.Value + MaxValue(capacity-book.Weight, rest)
+	withoutBook := MaxValue(capacity, rest)
 	if book.Weight > capacity {
 		return withoutBook
 	}

main_test.go

@@ -14,7 +14,9 @@ func TestDefaultsZero(t *testing.T) {
 }
 
 func TestFitsOne(t *testing.T) {
-	result := ks.MaxValue(1, []ks.Book{{Weight: 1, Value: 2}})
+	result := ks.MaxValue(1, []ks.Book{
+		{Weight: 1, Value: 2},
+	})
 	be.Equal(t, 2, result)
 }