Imports of router-walk command

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/go-chi/chi/v5Package chi is a small, idiomatic and composable router for building HTTP services.
net/httpPackage http provides HTTP client and server implementations.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.