Simplify the code, using `into_encoded_bytes` #645

Job	Run time
cargo-deny	28s
check-blocking	3s
cargo-deny-advisories	30s
check-packetline (ubuntu-latest)	5s
lint	1m 34s
pure-rust-build	2m 4s
test	10m 49s
test-32bit (i386)	5m 48s
test-32bit (arm32v7)	5m 56s
test-fixtures-windows	14m 56s
test-journey	4m 13s
test-fast (windows-latest)	13m 51s
test-fast (macos-latest)	3m 37s
WebAssembly (wasm32-unknown-unknown)	1m 7s
test-fast (ubuntu-latest)	3m 36s
test-fast (ubuntu-22.04-arm)	6m 5s
WebAssembly (wasm32-wasip1)	44s
Tests pass	1s
	1h 15m 27s

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