Hi all,

I have been trying to solve an exercism exercise using Rust. The function signature is fixed and I can't change it. The real task is more complex but knowing how to fix the code below will give me insight to solve my issue over at exercism.

I posted the below code to show my intention instead of the entire history of what I tried. I would appreciate it if someone can show me the most idiomatic way to return the text in the_string_to_modify with the first two characters swapped within the constraints of the modify_string function signature.

fn modify_string(the_string_to_modify: &str) -> String
{
    //I tried this but still cryptic error messages
    //let mut working_the_string_to_modify_copy = the_string_to_modify.clone();

    let mut aux = b'0';
    
    //Replaced the_string_to_modify with working_the_string_to_modify_copy
    //but not success in what I have tried
    aux = the_string_to_modify.as_bytes()[0];
    the_string_to_modify.as_bytes()[0] = the_string_to_modify.as_bytes()[1];
    the_string_to_modify.as_bytes()[1] = aux;
    
    the_string_to_modify.to_string()
}

fn main()
{
    let string_to_modify = "abc";
    let modified_string = modify_string(string_to_modify);
    println!("{modified_string}");
}

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