diff --git a/src/detections/pivot.rs b/src/detections/pivot.rs
index 2f83c162..040ab57e 100644
--- a/src/detections/pivot.rs
+++ b/src/detections/pivot.rs
@@ -7,7 +7,7 @@ use std::sync::RwLock;
 use crate::detections::configs;
 use crate::detections::utils::get_serde_number_to_string;
 
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub struct PivotKeyword {
     pub keywords: HashSet<String>,
     pub fields: HashSet<String>,
diff --git a/src/detections/print.rs b/src/detections/print.rs
index 0f83b02e..5d5d6b43 100644
--- a/src/detections/print.rs
+++ b/src/detections/print.rs
@@ -252,10 +252,10 @@ impl AlertMessage {
                 .as_bytes(),
             )
             .ok();
-        let error_logs = ERROR_LOG_STACK.lock().unwrap().clone();
-        for error_log in error_logs.iter() {
+        let error_logs = ERROR_LOG_STACK.lock().unwrap();
+        error_logs.iter().for_each(|error_log| {
             writeln!(error_log_writer, "{}", error_log).ok();
-        }
+        });
         println!(
             "Errors were generated. Please check {} for details.",
             *ERROR_LOG_PATH
diff --git a/src/main.rs b/src/main.rs
index 78b05eb1..fcc0bd31 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -152,8 +152,8 @@ impl App {
         }
 
         if let Some(csv_path) = configs::CONFIG.read().unwrap().args.value_of("output") {
-            let pivot_key_unions = PIVOT_KEYWORD.read().unwrap().clone();
-            for (key, _) in pivot_key_unions.iter() {
+            let pivot_key_unions = PIVOT_KEYWORD.read().unwrap();
+            pivot_key_unions.iter().for_each(|(key, _)| {
                 let keywords_file_name = csv_path.to_owned() + "-" + key + ".txt";
                 if Path::new(&keywords_file_name).exists() {
                     AlertMessage::alert(&format!(
@@ -163,7 +163,7 @@ impl App {
                     .ok();
                     return;
                 }
-            }
+            });
             if Path::new(csv_path).exists() {
                 AlertMessage::alert(&format!(
                     " The file {} already exists. Please specify a different filename.",
@@ -297,8 +297,8 @@ impl App {
         if *PIVOT_KEYWORD_LIST_FLAG {
             //ファイル出力の場合
             if let Some(pivot_file) = configs::CONFIG.read().unwrap().args.value_of("output") {
-                let pivot_key_unions = PIVOT_KEYWORD.read().unwrap().clone();
-                for (key, pivot_keyword) in pivot_key_unions.iter() {
+                let pivot_key_unions = PIVOT_KEYWORD.read().unwrap();
+                pivot_key_unions.iter().for_each(|(key, pivot_keyword)| {
                     let mut f = BufWriter::new(
                         fs::File::create(pivot_file.to_owned() + "-" + key + ".txt").unwrap(),
                     );
@@ -317,7 +317,7 @@ impl App {
                     }
 
                     f.write_all(output.as_bytes()).unwrap();
-                }
+                });
 
                 //output to stdout
                 let mut output =
@@ -330,8 +330,8 @@ impl App {
             } else {
                 //標準出力の場合
                 let mut output = "The following pivot keywords were found:\n".to_string();
-                let pivot_key_unions = PIVOT_KEYWORD.read().unwrap().clone();
-                for (key, pivot_keyword) in pivot_key_unions.iter() {
+                let pivot_key_unions = PIVOT_KEYWORD.read().unwrap();
+                pivot_key_unions.iter().for_each(|(key, pivot_keyword)| {
                     output += &format!("{}: ", key).to_string();
 
                     output += "( ";
@@ -346,7 +346,7 @@ impl App {
                     }
 
                     output += "\n";
-                }
+                });
                 write_color_buffer(BufferWriter::stdout(ColorChoice::Always), None, &output).ok();
             }
         }