// check if mirror binary tree or not (give two binary trees and you need to find if they are a mirror to each other )
const isMirror =(tree1 ,tree2)=>{
if(tree1 ===null && tree2 ===null) return true ;
if(tree1.data == tree2.data){
if(isMirror(tree1.left ,tree2.right) && isMirror(tree1.right ,tree2.left)){
return true
}else return false
} else{
return false
}
}