Rust crazy pointer ref

Question

I think ref pointer is strange in rust and if some one less newest than me can explain how it's deeply working.

fn functionc(var: &i32, opinion: &str) {
    // {:p} print the address
    println!("Ma value: address - {:p}  &   value - {:?} - {}", var, var, opinion);
}

fn main() {
    let n = 55;
    let i = 33;
    let i2 = &i;
    let i3 = &i2;
    let i4 = &i3;
    let i5 = &i4;

    functionc(&n, "normal");
    functionc(&i, "normal");

    functionc(i2, "normal");

    functionc(*i3, "normal"); // Good way
    functionc(&i3, "strange"); // Hum shouldn't work

    functionc(**i4, "normal");
    functionc(***i5, "normal");

    // functionc(****i5); Generate error: It's normal


    functionc(&&&&&&&&&&&&&&&&&&&&&&&&&&&&i3, "strange"); // Hum OK why not ;)
}

https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=1c9ff70edd88186f6e43fba957403a5f

I expected error on functionc(&i3, "strange");

But it works.

Who do magic:

let i3 = &i2;

or

functionc(&i3, "strange");

or

println!({:p});