add byName, it implements sort.Sort interface

day-24/internal/one/zwire.go

@@ -2,6 +2,18 @@ package one
 
 const noValue = -1
 
+type byName []zWire
+
+func (b byName) Len() int {
+	return len(b)
+}
+func (b byName) Less(i, j int) bool {
+	return b[j].name < b[i].name
+}
+func (b byName) Swap(i, j int) {
+	b[i], b[j] = b[j], b[i]
+}
+
 type zWire struct {
 	name  string
 	value int