removed an unecessary allocation

you know what they say, premature optimisation is the best optimisation

rustfmt.toml

@@ -0,0 +1,4 @@
+max_width = 120
+hard_tabs = true
+tab_spaces = 2
+newline_style = "Unix"

src/findings.rs

@@ -1,7 +1,6 @@
 use std::path::PathBuf;
 
 use mime_guess::Mime;
-use smartstring::alias::String;
 
 use crate::inspectors::mime_extension_lookup;
 
@@ -16,7 +15,7 @@ pub struct Findings {
 }
 
 impl Findings {
-	pub fn recommended_extension(&self) -> Option<String> {
-		mime_extension_lookup(self.mime.clone()).map(|extensions| extensions[0].to_owned())
+	pub fn recommended_extension(&self) -> Option<&str> {
+		mime_extension_lookup(self.mime.clone()).map(|extensions| &*extensions[0])
 	}
 }