cargo fmt and clippy

core/vdbe/explain.rs

@@ -1145,7 +1145,7 @@ pub fn insn_to_str(
                 0,
                 OwnedValue::build_text(Rc::new("".to_string())),
                 0,
-                format!(""),
+                String::new(),
             ),
         };
     format!(

core/vdbe/insn.rs

@@ -564,7 +564,6 @@ pub enum Insn {
         dest: usize,
     },
     Noop,
-    
 }
 
 fn cast_text_to_numerical(value: &str) -> OwnedValue {