refactor: group uuid instead of index

internal/number/number.go

@@ -1,7 +1,6 @@
 package number
 
 import (
-	"cmp"
 	"math"
 )
 
@@ -21,10 +20,3 @@ func fixed(num float64, precision int) float64 {
 func round(num float64) int {
 	return int(num + math.Copysign(0.5, num))
 }
-
-func Max[T cmp.Ordered](x, y T) T {
-	if cmp.Compare(x, y) == 1 {
-		return x
-	}
-	return y
-}