How to add tool functionality to a character's hand?

[Masked Koopa]

I have been trying to add the ability to "slap" a tree or rock with an empty hand to an existing modded character, but I'm not really sure where the code from here: 

goes. Does it go in a seperate .lua file and then I add the tag "hardhand" to the character? )Sorry if this is too basic a question, I'm not really looking into making full blown mods, I just wanted to add this attribute.)

[Masked Koopa]

I don't see an edit button, but I figured out I had to put the main code chunk in the modmain.lua. My next question is how do I make it a normal left click type of mining?

I tried to swap out the references to Right to Left but it caused an error, and I want following pigs/merms/bunnies to copy whatever you are doing.

Edited January 5, 2021 by Masked Koopa