Function decode_string 

pub fn decode_string(buf: &mut impl Buf) -> Result<String, DecodeError>

Decode a string value: read a varint length prefix, then that many bytes, and validate that the bytes are valid UTF-8.

Errors

• DecodeError::UnexpectedEof if the buffer has fewer bytes than the declared length.
• DecodeError::MessageTooLarge if the declared length overflows usize.
• DecodeError::InvalidUtf8 if the bytes are not valid UTF-8.