[SOLVED] Text formatting (get registry name of block w/o mod_id)

• Solved by @BaR1BoD using custom code snippet, check out comments

I'm trying to get only registry name of block, since I transfer this to loot table drop in function
Example:
Procedure break blocks in 5x5 area, dropping for every block it's own drop using loot table

Drop item from loot table "blocks/registry_name", but function Get registry name of Local_block_coordinate gives "minecraft:stone", however we need just stone

to append it later to "block/HERE" w/o mod_id (minecraft)

So the task is not really complex, just to substring text from first " : " character
Is there any built-in function to do that?

How I resolved it:

Created local variable reg_name
While ( Does text "reg_name" contain " : " -> Set variable "reg_name" to ( Substring "reg_name" from position 1 ) )

https://imgur.com/a/TL7Y71a

Just simply cutting 1st character in each iteration until we get registry_name w/o " : " separator

But I can't sleep with it, 25(cause of 5x5 area) * 10 iterations (cause of "minecraft:" for example) = 250 uses of function per block break
Seems really unoptimized, but it works. So, can we format that an easier way?
Thanks for any advice!