Add remote storage backend

internal/adapters/storage/keys_test.go

@@ -0,0 +1,21 @@
+package storage
+
+import "testing"
+
+func TestNormalizeObjectKey(t *testing.T) {
+	tests := []struct {
+		in   string
+		want string
+	}{
+		{in: `dnd\campaigns\forsaken\a.flac`, want: "dnd/campaigns/forsaken/a.flac"},
+		{in: " /dnd/campaigns/forsaken/a.flac ", want: "dnd/campaigns/forsaken/a.flac"},
+		{in: "//dnd/campaigns/forsaken/a.flac", want: "dnd/campaigns/forsaken/a.flac"},
+		{in: "", want: ""},
+	}
+
+	for _, tt := range tests {
+		if got := normalizeObjectKey(tt.in); got != tt.want {
+			t.Fatalf("normalizeObjectKey(%q) = %q, want %q", tt.in, got, tt.want)
+		}
+	}
+}