refactor: removes useless else to get more idiomatic GO code

[chavacava]

This PR removes useless else statements and replaces code blocks to get more idiomatic Go code and less deep nesting.

Refs: https://youtu.be/5DVV36uqQ4E?t=660

[AnyCPU]

some notes:

1. actually there are a lot of good code style guides from Google, Uber etc, but yes - some else is redundant;
2. this pr is huge, maybe it is ok to decouple something;
3. some if-chains could be written as switches, for instance:

Origin:

if strings.HasSuffix(bnm, "s") {
	return "List of " + bnm
} else if strings.Contains(bnm, "Function of") {
	return strings.ReplaceAll(bnm, "Function of", "Functions of") + "s"
} else {
	return bnm + "s"
}

Result:

switch {
    case strings.HasSuffix(bnm, "s"):
        return "List of " + bnm

    case strings.Contains(bnm, "Function of"):
        return strings.ReplaceAll(bnm, "Function of", "Functions of") + "s"

    default:
        return bnm + "s"
}

or maybe someone would like to introduce a new string var and use single return.