Golang : constant 20013 overflows byte error message

Haven't been updating the tutorials portion for a while as I was busy writing up examples for Golang bytes package. While executing the bytes.Buffer.WriteByte function example. The program exited with the error message "constant 20013 overflows byte error message".

Upon further investigation, it was caused by this line in the code

 buff.WriteByte('中')

To fix this error which is attempting to write UTF8 character, simply replace WriteByte() with WriteRune() function.

 buff.WriteRune('中')

Hope this will be helpful to whoever that encounter this error message.