Fixed some clippy complaining

src/simulator/mem_cmp.rs

@@ -2,7 +2,6 @@ use std::fs;
 use std::io::BufRead;
 use std::io::BufReader;
 use std::io::Lines;
-use std::io::Read;
 use crate::Machine;
 
 const MEM_SIZE : usize = 4096;
@@ -239,7 +238,7 @@ impl MemChecker{
 
 fn string_hex_to_usize(s: &String) -> usize {
 
-    if s.len() == 0 {
+    if s.is_empty() {
         return 0;
     }
 
@@ -253,7 +252,7 @@ fn string_hex_to_usize(s: &String) -> usize {
         ret_value += base.pow(max_pow - (i as u32))*tmp;
     }
 
-    return ret_value;
+    ret_value
 }
 
 
@@ -271,8 +270,7 @@ fn one_hex_to_dec(c: char) -> u8 {
         'E' | 'e' => 14,
         'F' | 'f' => 15,
         _ => {
-            let ret : u8 = c.to_digit(10).unwrap() as u8;
-            return ret; 
+            c.to_digit(10).unwrap() as u8 
         },
     }
 }
@@ -368,12 +366,7 @@ mod tests {
         };
 
         let section = Section::from(&section_format);
-        let mut expected_vec:  Vec<u8> = Vec::new();
-        expected_vec.push(0u8);
-        expected_vec.push(255u8);
-        expected_vec.push(10u8);
-        expected_vec.push(160u8);
-        expected_vec.push(165u8);
+        let expected_vec:  Vec<u8> = vec![0u8, 255u8, 10u8, 160u8, 165u8];
 
         //println!("Vec from created section {:?}", &section.content);
         //println!("Expected vec {:?}", &expected_vec);
@@ -384,13 +377,13 @@ mod tests {
     #[test]
     fn test_mod(){
         let cond = (0%2) == 0;
-        assert_eq!(true, cond);
+        assert!(cond);
     }
 
     #[test]
     fn test_mod_2(){
         let cond = (1%2) == 1;
-        assert_eq!(true, cond);
+        assert!(cond);
     }
 
     #[test]