feat: deduplicate ship name on transfer

internal/util/string.go

@@ -1,12 +1,16 @@
 package util
 
 import (
+	"fmt"
+	"math/rand"
 	"strings"
 	"unicode"
 )
 
-// Allowed special characters
-const specialChars = "!@#$%^*-_=+~()[]{}"
+const (
+	maxNameLength = 30
+	specialChars  = "!@#$%^*-_=+~()[]{}" // Allowed special characters
+)
 
 var allowedSpecialChars map[rune]bool
 
@@ -28,7 +32,7 @@ func ValidateTypeName(input string) (string, bool) {
 
 	runes := []rune(trimmed)
 
-	if len(runes) > 30 {
+	if len(runes) > maxNameLength {
 		return "", false
 	}
 
@@ -75,3 +79,21 @@ func ValidateTypeName(input string) (string, bool) {
 	// Return the trimmed string and true if all conditions are met
 	return trimmed, true
 }
+
+func AppendRandomSuffix(v string) string {
+	return AppendRandomSuffixGenerator(v, RandomSuffixGenerator)
+}
+
+func AppendRandomSuffixGenerator(v string, s func() string) string {
+	suffix := []rune(s())
+	str := []rune(v)
+	max := maxNameLength - len(suffix)
+	if len(str) > max {
+		str = str[:max]
+	}
+	return string(append(str, suffix...))
+}
+
+func RandomSuffixGenerator() string {
+	return fmt.Sprintf("%04d", rand.Intn(9999))
+}