some fixes and changes; #4

utils/utils.go

@@ -1,6 +1,10 @@
 package utils
 
-import "math/rand/v2"
+import (
+	"fmt"
+	"math/rand/v2"
+	"strconv"
+)
 
 func RandRange(min, max int) int {
 	return rand.IntN(max-min) + min
@@ -17,8 +21,18 @@ func Max(a, b int) int {
 	}
 	return b
 }
+func Map[S, R any](f func(s S) R, s []S) []R {
+	out := make([]R, len(s))
+	for i := range s {
+		out[i] = f(s[i])
+	}
+	return out
+}
 
 func PopSlice[S any](s []S, index int) []S {
+	if index == 0 {
+		return s[1:]
+	}
 	out := make([]S, 0)
 	for i, e := range s {
 		if i == index {
@@ -28,3 +42,26 @@ func PopSlice[S any](s []S, index int) []S {
 	}
 	return out
 }
+func TypedSliceToAny[S any](s []S) []any {
+	out := make([]any, len(s))
+	for i := range s {
+		out[i] = s[i]
+	}
+	return out
+}
+func AppendToInt[S any](v int, s []S) []any {
+	out := make([]any, 1, len(s)+1)
+	out[0] = v
+	out = append(out, TypedSliceToAny(s)...)
+	return out
+}
+func StringToInt(s string) int {
+	i, err := strconv.Atoi(s)
+	if err != nil {
+		return -1
+	}
+	return i
+}
+func AnyToString[A any](a A) string {
+	return fmt.Sprintf("%v", a)
+}