How to truncate a vector signal?

Gentlemen, I need your help: I have a 56 bit signal and I want to truncate it to 24 bits. I am using the fixed point format 2Q22. I want to truncate all 1's until I find a 0. The first two digits are the integer part and the rest 22 is what remains from the reset, truncating any excessive bit too.

For example:
11111111101000011111111100000000000000001111111111110000
(this binary number has 56 bits)

This must be truncaded to 01.0000111111111000000000 (the comma is for practical purposes only).

Thank you very much for your time