Fix the String
This code tries to push more text onto a string, but it doesn't compile! The variable needs to be a String (not a &str) and it needs to be mutable.
Fix the code so it prints:
text
Hello, world!
Hint: Change the string literal into a String using String::from() and don't forget to make it mut!
rust
fn main() {
let greeting = "Hello";
greeting.push_str(", world!");
println!("{}", greeting);
}