misc: applied some clippy lints

assembler/src/main.rs

@@ -1,8 +1,5 @@
 use std::{fs, io::Write, path::PathBuf};
 
-use assembler::{lexer, parser::Parser};
-use common::prelude::{ITypeArgs, Instruction, RTypeArgs, Register};
-
 fn main() {
     // parse args:
     let args: Vec<String> = std::env::args().collect();
@@ -16,7 +13,7 @@ fn main() {
     let src = PathBuf::from(input_path);
     let mut output_file = fs::File::create(output_path).unwrap();
 
-    let res = assembler::assemble(&src)
+    assembler::assemble(&src)
         .iter()
         .map(|i| i.encode())
         .for_each(|i| {