The log2 function output a string with 1 substituion to the web console.
#[wasm_bindgen(start)]
pub fn main() -> Result<(), JsValue> {
web_sys::console::log_2(&"%s Hello World".into(),&"John".into());
Ok(())
}
pub fn log_2(data_1: &JsValue, data_2: &JsValue)