Imports of package xrand

PathSynopsis
crypto/randPackage rand implements a cryptographically secure random number generator.
encoding/base64Package base64 implements base64 encoding as specified by RFC 4648.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
math/bigPackage big implements arbitrary-precision arithmetic (big numbers).
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.