strip trailing `/` from token min url

crates/cashu-sdk/src/client/mod.rs

@@ -122,11 +122,6 @@ pub struct Client {
 
 impl Client {
     pub fn new(mint_url: &str) -> Result<Self, Error> {
-        // HACK
-        let mut mint_url = String::from(mint_url);
-        if !mint_url.ends_with('/') {
-            mint_url.push('/');
-        }
         let mint_url = Url::parse(&mint_url)?;
         Ok(Self { mint_url })
     }

crates/cashu/src/url.rs

@@ -85,7 +85,7 @@ impl TryFrom<&UncheckedUrl> for Url {
 
 impl fmt::Display for UncheckedUrl {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.0)
+        write!(f, "{}", self.0.strip_suffix("/").unwrap_or(&self.0))
     }
 }