diff --git a/bfi-rust/src/interpreter/mod.rs b/bfi-rust/src/interpreter/mod.rs
index e636598..9d02624 100644
--- a/bfi-rust/src/interpreter/mod.rs
+++ b/bfi-rust/src/interpreter/mod.rs
@@ -50,7 +50,7 @@ fn parse(chars: Vec<char>, direct_print: bool) -> Vec<Statement> {
         }
     }
 
-    return loop_stack.pop().unwrap();
+    loop_stack.pop().unwrap()
 }
 
 #[cfg(test)]
diff --git a/bfi-rust/src/interpreter/optimized/mod.rs b/bfi-rust/src/interpreter/optimized/mod.rs
index 7df4ab4..8260f61 100644
--- a/bfi-rust/src/interpreter/optimized/mod.rs
+++ b/bfi-rust/src/interpreter/optimized/mod.rs
@@ -37,7 +37,7 @@ impl From<Statement> for ExStatement {
             Statement::In => ExStatement::In,
             Statement::Out => ExStatement::Out,
             Statement::Loop(v) => ExStatement::Loop(
-                v.into_iter().map(|s| ExStatement::from(s)).collect()
+                v.into_iter().map(ExStatement::from).collect()
             ),
             Statement::DOut => ExStatement::DOut
         }
@@ -66,20 +66,19 @@ impl Error for BfErr {}
 
 pub fn run(pgm: &str, direct_print: bool) -> Result<String, BfErr> {
     let pgm = minify(pgm);
-    if pgm.len() < 1 { return Err(BfErr::new("no program found")); };
+    if pgm.is_empty() { return Err(BfErr::new("no program found")); };
     let pgm = parse(pgm.chars().collect(), direct_print);
     let pgm = optimize(&pgm);
     let out = interpret(&pgm);
     Ok(out)
 }
 
-fn optimize(code: &Vec<Statement>) -> Vec<ExStatement> {
+fn optimize(code: &[Statement]) -> Vec<ExStatement> {
     let code = o_set_null(code);
-    let code = o_repeat(code);
-    code
+    o_repeat(code)
 }
 
-fn o_set_null(code: &Vec<Statement>) -> Vec<ExStatement> {
+fn o_set_null(code: &[Statement]) -> Vec<ExStatement> {
     code.iter().map(|s| {
         match s {
             Statement::Loop(v) => {
@@ -119,7 +118,7 @@ fn o_repeat(code: Vec<ExStatement>) -> Vec<ExStatement> {
     result
 }
 
-fn interpret(pgm: &Vec<ExStatement>) -> String {
+fn interpret(pgm: &[ExStatement]) -> String {
     let mut out = String::new();
     let mut pointer: usize = 0;
     let mut mem: [u8; MEM_SIZE] = [0; MEM_SIZE];
@@ -145,7 +144,7 @@ fn execute(statement: &ExStatement, mem: &mut Memory, pointer: &mut usize, out:
         }
         ExStatement::In => {
             let mut in_buffer = [0, 1];
-            stdin().read(&mut in_buffer).unwrap();
+            stdin().read_exact(&mut in_buffer).unwrap();
             mem[*pointer] = in_buffer[0] as u8;
         }
         ExStatement::Loop(vec) => {
diff --git a/bfi-rust/src/interpreter/parsed.rs b/bfi-rust/src/interpreter/parsed.rs
index eb9f769..ce0caa5 100644
--- a/bfi-rust/src/interpreter/parsed.rs
+++ b/bfi-rust/src/interpreter/parsed.rs
@@ -12,11 +12,10 @@ use crate::interpreter::{MEM_SIZE, Memory, minify, parse, Statement};
 pub fn run(pgm: &str) -> String {
     let pgm = minify(pgm);
     let pgm = parse(pgm.chars().collect(), false);
-    let out = interpret(&pgm);
-    out
+    interpret(&pgm)
 }
 
-fn interpret(pgm: &Vec<Statement>) -> String {
+fn interpret(pgm: &[Statement]) -> String {
     let mut out = String::new();
     let mut pointer: usize = 0;
     let mut mem: [u8; MEM_SIZE] = [0; MEM_SIZE];
@@ -37,7 +36,7 @@ fn execute(statement: &Statement, mem: &mut Memory, pointer: &mut usize, out: &m
         Statement::Out => out.push(mem[*pointer] as u8 as char),
         Statement::In => {
             let mut in_buffer = [0, 1];
-            stdin().read(&mut in_buffer).unwrap();
+            stdin().read_exact(&mut in_buffer).unwrap();
             mem[*pointer] = in_buffer[0] as u8;
         }
         Statement::Loop(vec) => {
diff --git a/bfi-rust/src/interpreter/simple.rs b/bfi-rust/src/interpreter/simple.rs
index f9ce80a..4652577 100644
--- a/bfi-rust/src/interpreter/simple.rs
+++ b/bfi-rust/src/interpreter/simple.rs
@@ -27,7 +27,7 @@ fn interpret(pgm: Vec<char>) -> String {
             '-' => mem[pointer] = mem[pointer].wrapping_sub(1),
             '.' => out.push(mem[pointer] as u8 as char),
             ',' => {
-                stdin().read(&mut in_buffer).unwrap();
+                stdin().read_exact(&mut in_buffer).unwrap();
                 mem[pointer] = in_buffer[0] as u8;
             }
             '[' => {
diff --git a/bfi-rust/src/main.rs b/bfi-rust/src/main.rs
index 222a01c..0215baf 100644
--- a/bfi-rust/src/main.rs
+++ b/bfi-rust/src/main.rs
@@ -1,11 +1,12 @@
 mod interpreter;
+mod repl;
 
 use std::{env, fs};
 use std::time::SystemTime;
 
 
 fn main() {
-    let path = env::args().skip(1).next();
+    let path = env::args().nth(1);
     let path = match path {
         Some(p) => p,
         None => {
diff --git a/bfi-rust/src/repl/mod.rs b/bfi-rust/src/repl/mod.rs
new file mode 100644
index 0000000..e69de29