refactor: simplify with strings.Prefix, strings.CutPrefix (#1137)

cli/main.go

@@ -189,10 +189,7 @@ func getVersion(builtBy, date, commit, version string) string {
 	if version == defaultVersion {
 		bi, ok := debug.ReadBuildInfo()
 		if ok {
-			version = bi.Main.Version
+			version = strings.TrimPrefix(bi.Main.Version, "v")
-			if strings.HasPrefix(version, "v") {
-				version = strings.TrimLeft(bi.Main.Version, "v")
-			}
 			if len(buildInfo) == 0 {
 				return fmt.Sprintf("version %s\n", version)
 			}

rule/exported.go

@@ -252,8 +252,8 @@ func (w *lintExported) lintTypeDoc(t *ast.TypeSpec, doc *ast.CommentGroup) {
 		if t.Name.Name == a {
 			continue
 		}
-		if strings.HasPrefix(s, a+" ") {
+		var found bool
-			s = s[len(a)+1:]
+		if s, found = strings.CutPrefix(s, a+" "); found {
 			break
 		}
 	}

rule/struct_tag.go

@@ -139,8 +139,8 @@ func (lintStructTagRule) getTagName(tag *structtag.Tag) string {
 	switch tag.Key {
 	case keyProtobuf:
 		for _, option := range tag.Options {
-			if strings.HasPrefix(option, "name=") {
+			if tagName, found := strings.CutPrefix(option, "name="); found {
-				return strings.TrimPrefix(option, "name=")
+				return tagName
 			}
 		}
 		return "" // protobuf tag lacks 'name' option