How can I pass a variable by reference so functions can modify or even reassign it?

[limber valve]

in setConfig it should be

*config = Config{
  Val: "new val",
}

Or just config.Val = "new val"

You wanna change the value of what config points to, not assign it to a new struct

also in printJsonConfig you'd want to check if config == nil, before trying to marshal, and then printing "nil"

@wild sedge

[verbal rune]

this one