implements alternate formatting for address

src/util/address.rs

@@ -359,11 +359,7 @@ impl Address {
     /// Even inside Bitcoin URI may be more efficient to use the uppercase address since in QR codes
     /// encoding modes can be mixed as needed within a QR symbol.
     pub fn to_qr_string(&self) -> String {
-        let address_string = self.to_string();
-        match self.payload {
-            Payload::WitnessProgram { .. } => address_string.to_ascii_uppercase(),
-            _ => address_string,
-        }
+        format!("{:#}", self)
     }
 }
 
@@ -392,6 +388,11 @@ impl fmt::Display for Address {
                 version: ver,
                 program: ref prog,
             } => {
+                if fmt.alternate() {
+                    //TODO format without allocation when alternate uppercase is in bech32
+                    let lower = self.to_string();
+                    write!(fmt, "{}", lower.to_ascii_uppercase())
+                } else {
                     let hrp = match self.network {
                         Network::Bitcoin => "bc",
                         Network::Testnet | Network::Signet => "tb",
@@ -403,6 +404,7 @@ impl fmt::Display for Address {
                 }
             }
         }
+    }
 }
 
 /// Extract the bech32 prefix.