Use single fixed-width format! macro for SpotifyId.to_base16

Cargo.lock

@@ -492,7 +492,10 @@ name = "env_logger"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "atty 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "termcolor 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 

core/src/spotify_id.rs

@@ -55,7 +55,7 @@ impl SpotifyId {
     }
 
     pub fn to_base16(&self) -> String {
-        format!("{:0>32}", format!("{:x}", self.0))
+        format!("{:032x}", self.0)
     }
 
     pub fn to_base62(&self) -> String {