Function encode_into_string 

pub fn encode_into_string(output: &mut String, data: &[u8], alphabet: Alphabet)

Available on crate feature alloc only.

Appends the base64-encoded representation of data to a [String].

Example

let mut s = String::from("tag: ");
base64::encode_into_string(&mut s, b"hello", base64::Alphabet::Standard);
assert_eq!(s, "tag: aGVsbG8=");