Check if all leaves are at same level

Suppose that given binary tree are contains N nodes. Check if programmatically, on this binary tree all leaf nodes are exist in a same level. For example.

Here given code implementation process.

1) Check if all leaf nodes are at same level in java 2) Check if all leaf nodes are at same level in c++ 3) Check if all leaf nodes are at same level in c 4) Check if all leaf nodes are at same level in golang 5) Check if all leaf nodes are at same level in c# 6) Check if all leaf nodes are at same level in vb.net 7) Check if all leaf nodes are at same level in php 8) Check if all leaf nodes are at same level in node js 9) Check if all leaf nodes are at same level in typescript 10) Check if all leaf nodes are at same level in python 11) Check if all leaf nodes are at same level in ruby 12) Check if all leaf nodes are at same level in scala 13) Check if all leaf nodes are at same level in swift 14) Check if all leaf nodes are at same level in kotlin