diff --git a/crates/runc/src/lib.rs b/crates/runc/src/lib.rs
index 6664b22..2d96519 100644
--- a/crates/runc/src/lib.rs
+++ b/crates/runc/src/lib.rs
@@ -57,7 +57,6 @@ use crate::error::Error;
 #[cfg(feature = "async")]
 use crate::monitor::{DefaultMonitor, Exit, ProcessMonitor};
 use crate::options::*;
-use crate::utils::{JSON, TEXT};
 
 type Result<T> = std::result::Result<T, crate::error::Error>;
 
diff --git a/crates/runc/src/options.rs b/crates/runc/src/options.rs
index 819abc2..7251c71 100644
--- a/crates/runc/src/options.rs
+++ b/crates/runc/src/options.rs
@@ -39,9 +39,37 @@ use std::time::Duration;
 
 use crate::error::Error;
 use crate::io::Io;
-use crate::utils::{self, ALL, CONSOLE_SOCKET, DETACH, FORCE, NO_NEW_KEYRING, NO_PIVOT, PID_FILE};
+use crate::utils;
 use crate::{LogFormat, Runc};
 
+// constants for log format
+pub const JSON: &str = "json";
+pub const TEXT: &str = "text";
+
+// constants for runc global flags
+const DEBUG: &str = "--debug";
+const LOG: &str = "--log";
+const LOG_FORMAT: &str = "--log-format";
+const ROOT: &str = "--root";
+const ROOTLESS: &str = "--rootless";
+const SYSTEMD_CGROUP: &str = "--systemd-cgroup";
+
+// constants for runc-create/runc-exec flags
+const CONSOLE_SOCKET: &str = "--console-socket";
+const DETACH: &str = "--detach";
+const NO_NEW_KEYRING: &str = "--no-new-keyring";
+const NO_PIVOT: &str = "--no-pivot";
+const PID_FILE: &str = "--pid-file";
+
+// constants for runc-kill flags
+const ALL: &str = "--all";
+
+// constants for runc-delete flags
+const FORCE: &str = "--force";
+
+// constant for command
+pub const DEFAULT_COMMAND: &str = "runc";
+
 pub trait Args {
     type Output;
 
@@ -185,33 +213,33 @@ impl Args for GlobalOpts {
 
         // --root path : Set the root directory to store containers' state.
         if let Some(root) = &self.root {
-            args.push("--root".into());
+            args.push(ROOT.into());
             args.push(utils::abs_string(root)?);
         }
 
         // --debug : Enable debug logging.
         if self.debug {
-            args.push("--debug".into());
+            args.push(DEBUG.into());
         }
 
         // --log path : Set the log destination to path. The default is to log to stderr.
         if let Some(log_path) = &self.log {
-            args.push("--log".into());
+            args.push(LOG.into());
             args.push(utils::abs_string(log_path)?);
         }
 
         // --log-format text|json : Set the log format (default is text).
-        args.push("--log-format".into());
+        args.push(LOG_FORMAT.into());
         args.push(self.log_format.to_string());
 
         // --systemd-cgroup : Enable systemd cgroup support.
         if self.systemd_cgroup {
-            args.push("--systemd-cgroup".into());
+            args.push(SYSTEMD_CGROUP.into());
         }
 
         // --rootless true|false|auto : Enable or disable rootless mode.
         if let Some(mode) = self.rootless {
-            let arg = format!("--rootless={}", mode);
+            let arg = format!("{}={}", ROOTLESS, mode);
             args.push(arg);
         }
 
diff --git a/crates/runc/src/utils.rs b/crates/runc/src/utils.rs
index 9577958..a16a29b 100644
--- a/crates/runc/src/utils.rs
+++ b/crates/runc/src/utils.rs
@@ -25,29 +25,6 @@ use uuid::Uuid;
 
 use crate::error::Error;
 
-// constants for flags
-pub const ALL: &str = "--all";
-pub const CONSOLE_SOCKET: &str = "--console-socket";
-// pub const CRIU: &str = "--criu";
-pub const DEBUG: &str = "--debug";
-pub const DETACH: &str = "--detach";
-pub const FORCE: &str = "--force";
-pub const LOG: &str = "--log";
-pub const LOG_FORMAT: &str = "--log-format";
-pub const NO_NEW_KEYRING: &str = "--no-new-keyring";
-pub const NO_PIVOT: &str = "--no-pivot";
-pub const PID_FILE: &str = "--pid-file";
-pub const ROOT: &str = "--root";
-pub const ROOTLESS: &str = "--rootless";
-pub const SYSTEMD_CGROUP: &str = "--systemd-cgroup";
-
-// constants for log format
-pub const JSON: &str = "json";
-pub const TEXT: &str = "text";
-
-// constant for command
-pub const DEFAULT_COMMAND: &str = "runc";
-
 // helper to resolve path (such as path for runc binary, pid files, etc. )
 pub fn abs_path_buf<P>(path: P) -> Result<PathBuf, Error>
 where