Given a non-negative integer num, Return its encoding string.
The encoding is done by converting the integer to a string using a secret function that you should deduce from the following table:
Example 1:
Input: num = 23 Output: "1000"
Example 2:
Input: num = 107 Output: "101100"
Constraints:
<li><code>0 <= num <= 10^9</code></li>