remove two unnecessary string heap allocs

Signed-off-by: strawberry <strawberry@puppygock.gay>

Cargo.toml

@@ -277,7 +277,7 @@ empty_drop = "warn"
 exit = "warn"
 filetype_is_file = "warn"
 float_cmp_const = "warn"
-# format_push_string = "warn"
+format_push_string = "warn"
 impl_trait_in_params = "warn"
 infinite_loop = "warn"
 # let_underscore_untyped = "warn"

src/config/mod.rs

@@ -1,6 +1,7 @@
 use std::{
     collections::BTreeMap,
     fmt,
+    fmt::Write as _,
     net::{IpAddr, Ipv4Addr},
     path::PathBuf,
 };
@@ -398,7 +399,7 @@ impl fmt::Display for Config {
         let mut msg: String = "Active config values:\n\n".to_owned();
 
         for line in lines.into_iter().enumerate() {
-            msg += &format!("{}: {}\n", line.1 .0, line.1 .1);
+            let _ = writeln!(msg, "{}: {}", line.1 .0, line.1 .1);
         }
 
         write!(f, "{msg}")

src/service/admin/mod.rs

@@ -4,7 +4,7 @@ use std::{
     time::Instant,
 };
 
-use std::fmt::Write;
+use std::fmt::Write as _;
 
 use clap::{Parser, Subcommand};
 use regex::Regex;
@@ -1730,8 +1730,9 @@ impl Service {
 
                     for (r, (e, i)) in map.iter() {
                         let elapsed = i.elapsed();
-                        msg += &format!(
-                            "{} {}: {}m{}s\n",
+                        let _ = writeln!(
+                            msg,
+                            "{} {}: {}m{}s",
                             r,
                             e,
                             elapsed.as_secs() / 60,