修复多次显示列名的问题

src/prehandle.rs

@@ -1,7 +1,6 @@
 use std::{io::Read, path::PathBuf};
 use std::fs::File;
 use std::io::{BufRead, BufReader, Cursor};
-use std::ptr::read;
 
 pub fn handle(path: PathBuf, filter_str:String, start_index: u32, end_index: u32) -> Box<dyn Read>{
     let reader = BufReader::new(File::open(path).unwrap());
@@ -27,6 +26,7 @@ fn take(reader: &mut Vec<String>, start_index: u32, end_index: u32) -> Vec<Strin
         return reader.to_owned();
     }
     let header = reader[0].clone();
+    reader.remove(0);
     let mut body= Vec::new();
     body.push(header);
     if end_index == 0{