Generate command to be evaluated later

I want to create a function which will gets to numbers and a variable name and return a command which evaluates which one of them is bigger and set that value to a new variable.
Lets call that function _max
So if I call:
_max(2,3,a)
It should return the following string:
"set a [max 2 3]"

I can do it using really ugly tricks with string map, but I prefer not to if I can avoid it.

This is really simple example so please no specific solutions for this example, since my actual problem is more complicated than this :<

Thanks.
.

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