diff --git a/src/main.rs b/src/main.rs
index ff056dd..8b84982 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
     // Disallowed_chars is an optional argument
     let disallowed_chars: Option<&String> = args.get(2);
 
-    let allowed_chars: String = String::from("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{}|;':,./<>?");
+    let allowed_chars: &str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{}|;':,./<>?";
 
     let mut allowed_chars_set: HashSet<char> = allowed_chars.chars().collect();