diff --git a/src/lib.rs b/src/lib.rs
index 57dda36..92c834b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,9 +8,9 @@ pub struct Config {
 }
 
 impl Config {
-    pub fn build(mut args: Vec<String>) -> Result<Self, &'static str> {
+    pub fn build(mut args: &mut Vec<String>) -> Result<Self, &'static str> {
         args.remove(0); // Remove program path
-        let ignore_case = Self::ignore_case(&mut args);
+        let ignore_case = Self::ignore_case(args);
 
         if args.len() < 2 {
             return Err("Argument not enough!");
@@ -74,7 +74,7 @@ mod tests {
 
     use super::*;
 
-    fn run_search(args: Vec<String>) -> Vec<String> {
+    fn run_search(args: &mut Vec<String>) -> Vec<String> {
         let config = Config::build(args).unwrap();
 
         let file_content = std::fs::read_to_string(&config.file_path)
@@ -87,10 +87,10 @@ mod tests {
 
     #[test]
     fn test_search() {
-        let args: Vec<String> = vec!["target/debug/m-grep", "Who", "poem.txt"]
+        let mut args: Vec<String> = vec!["target/debug/m-grep", "Who", "poem.txt"]
             .iter().map(|&x| x.into()).collect();
         
-        let result = run_search(args);
+        let result = run_search(&mut args);
 
         for line in result {
             println!("{line}");
@@ -100,10 +100,10 @@ mod tests {
 
     #[test]
     fn test_search_ignorecase() {
-        let args: Vec<String> = vec!["target/debug/m-grep", "who", "poem.txt", "-i"]
+        let mut args: Vec<String> = vec!["target/debug/m-grep", "who", "poem.txt", "-i"]
             .iter().map(|&x| x.into()).collect();
         
-        let result = run_search(args);
+        let result = run_search(&mut args);
 
         for line in result {
             assert_eq!(line, format!("I'm nobody! {} are you?", "Who".green()));
diff --git a/src/main.rs b/src/main.rs
index 5c07f8f..9514ec2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,15 +4,15 @@ use std::process;
 use s_grep::{Config, search};
 
 fn main() {
-    let args: Vec<String> = std::env::args().collect();
+    let mut args: Vec<String> = std::env::args().collect();
     
-    if let Err(err) = run(args) {
+    if let Err(err) = run(&mut args) {
         eprintln!("{}: {}", "Error".red().bold(), err.to_string().red());
         process::exit(1);
     }
 }
 
-fn run(args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
+fn run(args: &mut Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
     let config = Config::build(args)?;
     let file_path = &config.file_path;