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Rust program to remove newline characters from the file

Rust | File I/O Example: Write a program to remove newline characters from the file.
Submitted by Nidhi, on October 31, 2021

Problem Solution:

In this program, we will open a text file and remove newline characters from the file and print the appropriate message.

Program/Source Code:

The source code to remove newline characters from the file is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to remove newline 
// characters from file

use std::fs::File;
use std::io::{self, Read, Write};

fn main() {
    // Handle errors
    run().unwrap();
}

fn run() -> Result<(), io::Error> {

    let word_from = "\n";
    let word_to = "";
    
    let mut source= File::open("sample.txt")?;
    let mut data1 = String::new();
    
    source.read_to_string(&mut data1)?;
    
    drop(source); 

    let data2 = data1.replace(&*word_from, &*word_to);

    let mut dest = File::create("sample.txt")?;
    dest.write(data2.as_bytes())?;

    println!("New line characters removed successfully");

    Ok(())
}

Output:

$ cat sample.txt 
Hello World
Hello India

$ rustc main.rs

$ ./main
New line characters removed successfully

$ cat sample.txt 
Hello WorldHello India

Explanation:

In the above program, we created a function run() and main(). The run() is a special type of function, it can handle generated errors. And, we removed newline characters from a file. In the main() function, we called the run() method and removed newline characters from a file, and printed the appropriate message.

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