diff --git a/src/euler51/src/main.rs b/src/euler51/src/main.rs
index f440b42..b4162a8 100644
--- a/src/euler51/src/main.rs
+++ b/src/euler51/src/main.rs
@@ -76,16 +76,6 @@ fn get_longest(mut vec: Vec<Vec<Int>>, print: bool) -> Vec<Int> {
     vec.into_iter().find(|v| v.len() == length).unwrap()
 }
 
-trait ToString {
-    fn to_string(&self) -> String;
-}
-
-impl ToString for Vec<u8> {
-    fn to_string(&self) -> String {
-        self.iter().map(|d| d.to_string()).collect()
-    }
-}
-
 trait ToDigits {
     fn to_digits(&self) -> Vec<u8>;
 }