diff --git a/cmd/joj3/conf/model.go b/cmd/joj3/conf/model.go
index 031fd14..ae5e33e 100644
--- a/cmd/joj3/conf/model.go
+++ b/cmd/joj3/conf/model.go
@@ -16,7 +16,7 @@ type ConfStage struct {
 	}
 	Parsers []struct {
 		Name string
-		With interface{}
+		With any
 	}
 }
 
diff --git a/internal/executor/local/executor.go b/internal/executor/local/executor.go
index 7679cef..565c0be 100644
--- a/internal/executor/local/executor.go
+++ b/internal/executor/local/executor.go
@@ -113,10 +113,7 @@ func ToRlimit(cmd stage.Cmd) ([]syscall.Rlimit, []int, error) {
 		if err := syscall.Getrlimit(syscall.RLIMIT_CPU, &current); err != nil {
 			return nil, nil, fmt.Errorf("getrlimit RLIMIT_CPU failed: %w", err)
 		}
-		userTimeLimit := (uint64(cmd.CPULimit) + 1e9 - 1) / 1e9 // ns to s
-		if userTimeLimit > current.Max {
-			userTimeLimit = current.Max
-		}
+		userTimeLimit := min((uint64(cmd.CPULimit)+1e9-1)/1e9, current.Max) // ns to s
 		rlimits = append(rlimits, syscall.Rlimit{
 			Cur: userTimeLimit,
 			Max: current.Max,
@@ -128,10 +125,7 @@ func ToRlimit(cmd stage.Cmd) ([]syscall.Rlimit, []int, error) {
 		if err := syscall.Getrlimit(syscall.RLIMIT_DATA, &current); err != nil {
 			return nil, nil, fmt.Errorf("getrlimit RLIMIT_DATA failed: %w", err)
 		}
-		userMemLimit := cmd.MemoryLimit
-		if userMemLimit > current.Max {
-			userMemLimit = current.Max
-		}
+		userMemLimit := min(cmd.MemoryLimit, current.Max)
 		rlimits = append(rlimits, syscall.Rlimit{
 			Cur: userMemLimit,
 			Max: current.Max,
@@ -143,10 +137,7 @@ func ToRlimit(cmd stage.Cmd) ([]syscall.Rlimit, []int, error) {
 		if err := syscall.Getrlimit(syscall.RLIMIT_STACK, &current); err != nil {
 			return nil, nil, fmt.Errorf("getrlimit RLIMIT_STACK failed: %w", err)
 		}
-		userStackLimit := cmd.StackLimit
-		if userStackLimit > current.Max {
-			userStackLimit = current.Max
-		}
+		userStackLimit := min(cmd.StackLimit, current.Max)
 		rlimits = append(rlimits, syscall.Rlimit{
 			Cur: userStackLimit,
 			Max: current.Max,
diff --git a/internal/executor/sandbox/executor.go b/internal/executor/sandbox/executor.go
index f58e48f..dda11bb 100644
--- a/internal/executor/sandbox/executor.go
+++ b/internal/executor/sandbox/executor.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log/slog"
+	"maps"
 
 	"github.com/criyle/go-judge/pb"
 	"github.com/joint-online-judge/JOJ3/internal/stage"
@@ -46,9 +47,7 @@ func (e *Sandbox) Run(cmds []stage.Cmd) ([]stage.ExecutorResult, error) {
 	}
 	results := convertPBResult(pbRet.Results)
 	for _, result := range results {
-		for fileName, fileID := range result.FileIDs {
-			e.cachedMap[fileName] = fileID
-		}
+		maps.Copy(e.cachedMap, result.FileIDs)
 	}
 	return results, nil
 }
diff --git a/internal/parser/clangtidy/formatter.go b/internal/parser/clangtidy/formatter.go
index 85ad3c2..46b6225 100644
--- a/internal/parser/clangtidy/formatter.go
+++ b/internal/parser/clangtidy/formatter.go
@@ -7,14 +7,14 @@ import (
 
 // Referenced from https://github.com/yuriisk/clang-tidy-converter/blob/master/clang_tidy_converter/parser/clang_tidy_parser.py
 type JsonMessage struct {
-	Type        string                 `json:"type"`
-	CheckName   string                 `json:"checkname"`
-	Description string                 `json:"description"`
-	Content     map[string]interface{} `json:"content"`
-	Categories  []string               `json:"categories"`
-	Location    map[string]interface{} `json:"location"`
-	Trace       map[string]interface{} `json:"trace"`
-	Severity    string                 `json:"severity"`
+	Type        string         `json:"type"`
+	CheckName   string         `json:"checkname"`
+	Description string         `json:"description"`
+	Content     map[string]any `json:"content"`
+	Categories  []string       `json:"categories"`
+	Location    map[string]any `json:"location"`
+	Trace       map[string]any `json:"trace"`
+	Severity    string         `json:"severity"`
 }
 
 func format(messages []ClangMessage) []JsonMessage {
@@ -49,7 +49,7 @@ func messagesToText(messages []ClangMessage) []string {
 	return textLines
 }
 
-func extractContent(message ClangMessage) map[string]interface{} {
+func extractContent(message ClangMessage) map[string]any {
 	detailLines := ""
 	for _, line := range message.detailsLines {
 		if line == "" {
@@ -63,7 +63,7 @@ func extractContent(message ClangMessage) map[string]interface{} {
 		}
 		detailLines += (line + "\n")
 	}
-	result := map[string]interface{}{
+	result := map[string]any{
 		"body": "```\n" + detailLines + "```",
 	}
 	return result
@@ -140,18 +140,18 @@ func extractCategories(message ClangMessage) []string {
 	return removeDuplicates(categories)
 }
 
-func extractLocation(message ClangMessage) map[string]interface{} {
-	location := map[string]interface{}{
+func extractLocation(message ClangMessage) map[string]any {
+	location := map[string]any{
 		"path": message.filepath,
-		"lines": map[string]interface{}{
+		"lines": map[string]any{
 			"begin": message.line,
 		},
 	}
 	return location
 }
 
-func extractOtherLocations(message ClangMessage) []map[string]interface{} {
-	locationList := []map[string]interface{}{}
+func extractOtherLocations(message ClangMessage) []map[string]any {
+	locationList := []map[string]any{}
 	for _, child := range message.children {
 		locationList = append(locationList, extractLocation(child))
 		locationList = append(locationList, extractOtherLocations(child)...)
@@ -159,8 +159,8 @@ func extractOtherLocations(message ClangMessage) []map[string]interface{} {
 	return locationList
 }
 
-func extractTrace(message ClangMessage) map[string]interface{} {
-	result := map[string]interface{}{
+func extractTrace(message ClangMessage) map[string]any {
+	result := map[string]any{
 		"locations": extractOtherLocations(message),
 	}
 	return result
diff --git a/internal/parser/cppcheck/parser.go b/internal/parser/cppcheck/parser.go
index 64a09de..b1560d7 100644
--- a/internal/parser/cppcheck/parser.go
+++ b/internal/parser/cppcheck/parser.go
@@ -21,8 +21,8 @@ func (*CppCheck) parse(executorResult stage.ExecutorResult, conf Conf) stage.Par
 	// stdout := executorResult.Files[conf.Stdout]
 	stderr := executorResult.Files[conf.Stderr]
 	records := make([]Record, 0)
-	lines := strings.Split(stderr, "\n")
-	for _, line := range lines {
+	lines := strings.SplitSeq(stderr, "\n")
+	for line := range lines {
 		if strings.TrimSpace(line) == "" {
 			continue
 		}