refactoring: remove return from prompt style fmt functions

src/prompt.rs

@@ -17,13 +17,13 @@ impl PromptStyle {
     }
 
     fn fmt_none(&self) -> String {
-        return "» ".to_string();
+        "» ".to_string()
     }
 
     fn fmt_simple_directory(&self) -> String {
         let path = env::current_dir().unwrap_or_default();
 
-        return format!("{} » ", path.to_string_lossy());
+        format!("{} » ", path.to_string_lossy())
     }
 
     fn fmt_bash_like(&self) -> String {
@@ -43,7 +43,7 @@ impl PromptStyle {
         let _hostname = gethostname::gethostname();
         let hostname = _hostname.to_string_lossy();
 
-        return format!("[{}@{} {}]$ ", username, hostname, dir_as_string);
+        format!("[{}@{} {}]$ ", username, hostname, dir_as_string)
     }
 }