Format a file, and then simplify the code, overwriting the original file

Tool for formatting Go source code.
More information: <https://golang.org/cmd/gofmt/>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

gofmt -s -w {{source.go}}

click the source code to copy install gofmt on any operating system with command-not-found.com