You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sample.go
    path of file: ./repos/piranha/test-resources/go/feature_flag/builtin_rules/boolean_expression_simplify/input
    
    the code of the file until where you have to start completion: /*
Copyright (c) 2023 Uber Technologies, Inc.

 <p>Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 except
    
func simplify_not() {
    if !exp.BoolValue("false") {
        fmt.Println("not false 1")
    } else {
        fmt.Println("cleaned up else")
    }
    if !(exp.BoolValue("false")) {
        fmt.Println("not false 2")
    } else {
        fmt.Println("cleaned up else")
    }

    if !exp.BoolValue("true") {
        fmt.Println("not true")
    } else {
        fmt.Println("else staying 1")
    }
    if !(exp.BoolValue("true")) {
        fmt.Println("not true")
    } else {
        fmt.Println("else staying 2")
    }
}