diff --git a/day-08/internal/one/graph.go b/day-08/internal/one/graph.go
index d85a752..8d3031b 100644
--- a/day-08/internal/one/graph.go
+++ b/day-08/internal/one/graph.go
@@ -2,8 +2,6 @@ package one
 
 import (
 	"strings"
-
-	"github.com/onyx-and-iris/aoc2024/day-08/internal/util"
 )
 
 type graph struct {
@@ -26,10 +24,10 @@ func (g *graph) isOutOfBounds(c coords) bool {
 
 func (g *graph) debug() string {
 	for _, antenna := range g.antennae {
-		g.data[antenna.y] = util.ReplaceAtIndex(g.data[antenna.y], antenna.identifier, antenna.x)
+		g.data[antenna.y] = replaceAtIndex(g.data[antenna.y], antenna.identifier, antenna.x)
 	}
 	for antinode := range g.antinodes {
-		g.data[antinode.y] = util.ReplaceAtIndex(g.data[antinode.y], '#', antinode.x)
+		g.data[antinode.y] = replaceAtIndex(g.data[antinode.y], '#', antinode.x)
 	}
 
 	return g.String()
diff --git a/day-08/internal/one/util.go b/day-08/internal/one/util.go
index 76fff67..3a7bc41 100644
--- a/day-08/internal/one/util.go
+++ b/day-08/internal/one/util.go
@@ -32,3 +32,9 @@ func parseLines(r io.Reader) (*graph, error) {
 
 	return graph, nil
 }
+
+func replaceAtIndex(s string, r rune, i int) string {
+	out := []rune(s)
+	out[i] = r
+	return string(out)
+}
diff --git a/day-08/internal/two/graph.go b/day-08/internal/two/graph.go
index 9d06da5..f61fccd 100644
--- a/day-08/internal/two/graph.go
+++ b/day-08/internal/two/graph.go
@@ -2,8 +2,6 @@ package two
 
 import (
 	"strings"
-
-	"github.com/onyx-and-iris/aoc2024/day-08/internal/util"
 )
 
 type graph struct {
@@ -26,10 +24,10 @@ func (g *graph) isOutOfBounds(c coords) bool {
 
 func (g *graph) debug() string {
 	for _, antenna := range g.antennae {
-		g.data[antenna.y] = util.ReplaceAtIndex(g.data[antenna.y], antenna.identifier, antenna.x)
+		g.data[antenna.y] = replaceAtIndex(g.data[antenna.y], antenna.identifier, antenna.x)
 	}
 	for antinode := range g.antinodes.data {
-		g.data[antinode.y] = util.ReplaceAtIndex(g.data[antinode.y], '#', antinode.x)
+		g.data[antinode.y] = replaceAtIndex(g.data[antinode.y], '#', antinode.x)
 	}
 
 	return g.String()
diff --git a/day-08/internal/two/solve.go b/day-08/internal/two/solve.go
index 3ab1650..1c06c85 100644
--- a/day-08/internal/two/solve.go
+++ b/day-08/internal/two/solve.go
@@ -27,8 +27,7 @@ func Solve(buf []byte) (int, error) {
 					continue
 				}
 
-				all := []coords{a.coords, b.coords}
-				for _, coords := range calcAntiNodePos(a.coords, b.coords, graph, all) {
+				for _, coords := range calcAntiNodePos(a.coords, b.coords, []coords{a.coords, b.coords}, graph) {
 					if !graph.antinodes.contains(coords) {
 						graph.antinodes.insert(coords)
 					}
@@ -44,7 +43,7 @@ func Solve(buf []byte) (int, error) {
 	return graph.antinodes.len(), nil
 }
 
-func calcAntiNodePos(a, b coords, graph *graph, all []coords) []coords {
+func calcAntiNodePos(a, b coords, all []coords, g *graph) []coords {
 	xdiff := int(math.Abs(float64(a.x - b.x)))
 	ydiff := int(math.Abs(float64(a.y - b.y)))
 
@@ -59,8 +58,8 @@ func calcAntiNodePos(a, b coords, graph *graph, all []coords) []coords {
 		next = newCoords(b.x-xdiff, b.y-ydiff)
 	}
 
-	if graph.isOutOfBounds(next) {
+	if g.isOutOfBounds(next) {
 		return all
 	}
-	return calcAntiNodePos(b, next, graph, append(all, next))
+	return calcAntiNodePos(b, next, append(all, next), g)
 }
diff --git a/day-08/internal/two/util.go b/day-08/internal/two/util.go
index 68b69cb..875a5fe 100644
--- a/day-08/internal/two/util.go
+++ b/day-08/internal/two/util.go
@@ -32,3 +32,9 @@ func parseLines(r io.Reader) (*graph, error) {
 
 	return graph, nil
 }
+
+func replaceAtIndex(s string, r rune, i int) string {
+	out := []rune(s)
+	out[i] = r
+	return string(out)
+}
diff --git a/day-08/internal/util/util.go b/day-08/internal/util/util.go
deleted file mode 100644
index dd8e76a..0000000
--- a/day-08/internal/util/util.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package util
-
-func ReplaceAtIndex(s string, r rune, i int) string {
-	out := []rune(s)
-	out[i] = r
-	return string(out)
-}