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3

let s1 = "0";
let s2 = "1";
let s = format!("{}{}", s1, s2);

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let s1: &str;
let s: String;
s.push_str(s1);

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4

let s1: &str;
let s2: &str;
let s = String::from_str(s1);
s.push_str(s2);

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let s: String;
let s1: &str = s.as_str();
let s2: &mut str = s.as_mut_str();

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2

let s: String;
let s1: &[u8] = s.as_bytes();

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2

let s: String
let s1: &mut Vec<u8> = s.as_mut_vec();

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2

let s: &str;
let s1 = String::from_str(s);

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3

let s: &[u8];
let s1 = String::from_utf8_lossy(s);
let s2 = String::from_utf8(s.to_vec()).unwrap();

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2

let s: Vec<u8>;
let s1 = String::from_utf8(s).unwrap();

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2

let s: String;
let c = s.chars().nth(index).unwrap();

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4

let s: String;
for c in s.chars() {
    
}