Scope and Assigment

Can anyone help , I get an error when run this:

fn main(){
    let mut d = String::from("hello");
    d = String::from("ahoy");
        
    println!("{d}, world!");
}

warning: value assigned to `d` is never read
 --> ownership.rs:2:17
  |
2 |     let mut d = String::from("hello");
  |                 ^^^^^^^^^^^^^^^^^^^^^
  |
  = help: maybe it is overwritten before being read?
  = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default

warning: 1 warning emitted

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