Make clippy changes

src/calc.rs

@@ -65,7 +65,7 @@ where
     // Convert chars to string for TOML map; insert into BTreeMap to be sorted
     let ordered: BTreeMap<_, _> = value
         .iter()
-        .map(|(key, t)| (String::from(*key), t.clone()))
+        .map(|(key, t)| (String::from(*key), t))
         .collect();
     ordered.serialize(serializer)
 }

src/main.rs

@@ -444,7 +444,7 @@ fn fmt_engineering(f: f64, precision: usize) -> String {
     let num_whole_digits = exp.rem_euclid(3) as usize + 1;
 
     // If this is a negative number, strip off the added space, otherwise keep the space (and next digit)
-    let num_str = if let Some(_) = num_str.strip_prefix(" -") {
+    let num_str = if num_str.strip_prefix(" -").is_some() {
         &num_str[1..]
     } else {
         num_str
@@ -474,7 +474,7 @@ fn fmt_separated(f: f64, sep: char) -> String {
     for i in 0..((end - start - 1).div_euclid(3)) {
         ret.insert(end - (i + 1) * 3, sep);
     }
-    format!("{}", ret)
+    ret
 }
 
 #[cfg(test)]