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))
+}

internal/util/string_test.go

@@ -1,6 +1,7 @@
 package util_test
 
 import (
+	"strings"
 	"testing"
 	"unicode/utf8"
 
@@ -238,3 +239,54 @@ func FuzzValidateString(f *testing.F) {
 		}
 	})
 }
+
+func TestAppendRandomSuffixGenerator(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		suffix   string
+		expected string
+	}{
+		{
+			name:     "Regular String",
+			input:    "Regular_String",
+			suffix:   "1234",
+			expected: "Regular_String1234",
+		},
+		{
+			name:     "Zero Length String",
+			input:    "",
+			suffix:   "1234",
+			expected: "1234",
+		},
+		{
+			name:     "Edge Case String len=28",
+			input:    "Edge_Case_String_ABCDEFGHIGK",
+			suffix:   "1234",
+			expected: "Edge_Case_String_ABCDEFGHI1234",
+		},
+		{
+			name:     "Extra Long String len=31",
+			input:    "Extra_Long_String_ABCDEFGHIGKLM",
+			suffix:   "1234",
+			expected: "Extra_Long_String_ABCDEFGH1234",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := util.AppendRandomSuffixGenerator(tt.input, func() string { return tt.suffix })
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+func TestRandomSuffixGenerator(t *testing.T) {
+	var last string
+	for range 100 {
+		s := util.RandomSuffixGenerator()
+		assert.Len(t, s, 4)
+		assert.NotEqual(t, last, s)
+		assert.True(t, strings.ContainsFunc(s, func(r rune) bool { return r >= '0' && r <= '9' }))
+		last = s
+	}
+}