do not clone EnvVar fields for Display

src/main.rs

@@ -109,14 +109,18 @@ impl EnvVar {
 }
 
 impl Display for EnvVar {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let key = self.name.clone();
+        match self.value {
-        match self.value.clone() {
+            Value::Null => write!(fmt, "{key}=null", key = self.name),
-            Value::Null => write!(f, "{key}=null"),
+            Value::Bool(bool) => write!(fmt, "{key}={bool}", key = self.name),
-            Value::Bool(bool) => write!(f, "{key}={bool}",),
+            Value::Number(ref number) => write!(fmt, "{key}={number}", key = self.name),
-            Value::Number(number) => write!(f, "{key}={number}"),
+            Value::String(ref string) => write!(
-            Value::String(string) => write!(f, r#"{key}="{}""#, string.replace('"', r#"\""#)),
+                fmt,
-            _ => write!(f, ""),
+                r#"{key}="{value}""#,
+                key = self.name,
+                value = string.replace('"', r#"\""#)
+            ),
+            _ => write!(fmt, ""),
         }
     }
 }