removed pre-allocation of outputs

it doesn’t really seem to affect the performance anyway. vec.push() is pretty good

src/main.rs

@@ -12,23 +12,11 @@ fn main() -> Result<()> {
         renames.insert(split[0].to_string(), split[1].to_string());
     }
     
-    
-    // get the number of lines in the file so we can pre-allocate the array
-    let pf = fs::read_to_string("playlist.m3u").expect("unable to read");
-    let num_lines = pf.split("\n").collect::<Vec<&str>>().len() - 1;
-    let mut outputs: Vec<String> = vec![String::new(); num_lines];
-    //println!("{}", num_lines);
+    let mut outputs = Vec::new();
 
     let pls_file = File::open("playlist.m3u")?;
-    let mut i = 0;
     for entry in BufReader::new(pls_file).lines() {
         let entry = entry?;
-        /*
-        match renames.get(&entry.to_string()) {
-            Some(line) => println!("found {}", line),
-            None => print!("")
-        }
-        */
         let new = renames.get(&entry).unwrap_or(&entry).to_string();
         /*
         if new != &entry {
@@ -37,16 +25,10 @@ fn main() -> Result<()> {
             println!("“{}” remains unchanged", entry);
         }
         */
-        outputs[i] = new;
-        i += 1;
+        outputs.push(new);
     }
-    /*for s in outputs {
-        println!("{}", s);
-    }*/
     let data = outputs.join("\n");
     fs::write("playlist2.m3u", data).expect("unable to write");
-    //println!("{}", pf);
-    //println!("{}", renames.get(&"a string".to_string()).unwrap());
     Ok(())
 }