private/version: replace custom stringsTitle

cases package has an option cases.NoLower for the behavior we need.

Change-Id: Ie5bd4c52384fff45228321e02ab2478b5fecf245

private/version/checker/client.go

@@ -12,10 +12,11 @@ import (
 	"reflect"
 	"strings"
 	"time"
-	"unicode"
 
 	"github.com/spacemonkeygo/monkit/v3"
 	"github.com/zeebo/errs"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 
 	"storj.io/private/version"
 )
@@ -126,46 +127,5 @@ func (client *Client) Process(ctx context.Context, processName string) (process
 }
 
 func kebabToPascal(str string) string {
-	return strings.ReplaceAll(stringsTitle(str), "-", "")
-}
-
-func stringsTitle(s string) string {
-	// strings.Title and cases.Title(language.Und) do different things.
-	// For example:
-	//   s := `StoragenodeUpdater`
-	//   strings.Title(s) == `StoragenodeUpdater`
-	//   cases.Title(language.Und).String(s) == `Storagenodeupdater`
-
-	// This reimplements strings.Title to bypass Deprecated notice.
-	prev := ' '
-	return strings.Map(
-		func(r rune) rune {
-			if isSeparator(prev) {
-				prev = r
-				return unicode.ToTitle(r)
-			}
-			prev = r
-			return r
-		}, s)
-}
-
-func isSeparator(r rune) bool {
-	// ASCII alphanumerics and underscore are not separators
-	if r <= 0x7F {
-		switch {
-		case '0' <= r && r <= '9':
-			return false
-		case 'a' <= r && r <= 'z':
-			return false
-		case 'A' <= r && r <= 'Z':
-			return false
-		case r == '_':
-			return false
-		}
-		return true
-	}
-	if unicode.IsLetter(r) || unicode.IsDigit(r) {
-		return false
-	}
-	return unicode.IsSpace(r)
+	return strings.ReplaceAll(cases.Title(language.Und, cases.NoLower).String(str), "-", "")
 }