مشکل ایجاد شکل در canvas

Question

window.onload=init;

function init(){
    let button = document.querySelector("#buttonh1");
    button.addEventListener("click",showInfo);
    var c=document.getElementById("#myCanvas");
    var ctx=c.getContext("2d");
    ctx.fillRect(100,100,150,75);
}

function showInfo(){
    let input1 = document.querySelector("#input1");
    let h1 = document.querySelector("#h1");
    h1.innerHTML="Welcom "+input1.value;
    
    let div2= document.querySelector("#div2");
    let h2 = document.createElement("h2");
    h2.innerHTML="Your score : 0";
    div2.appendChild(h2);

    input1.value ="";
   
}