| Path | Synopsis | 
|---|---|
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. | 
| golang.org/x/text/transform | Package transform provides reader and writer wrappers that transform the bytes passing through as well as various transformations. | 
| io | Package io provides basic interfaces to I/O primitives. | 
| unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |