Attempt to fix bugs related to empty vecs

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/lib/utils/ser.rs

@@ -58,12 +58,13 @@ where
     }
 }
 
-pub fn remove_slash_from_symbols<S>(pairs: &[String], serializer: S) -> Result<S::Ok, S::Error>
+pub fn remove_slash_from_symbols<'a, S, I>(pairs: I, serializer: S) -> Result<S::Ok, S::Error>
 where
     S: Serializer,
+    I: IntoIterator<Item = &'a String>,
 {
     let symbols = pairs
-        .iter()
+        .into_iter()
         .map(|pair| remove_slash(pair))
         .collect::<Vec<_>>();