Improvement: Simple structure of FontBook #12816

Job	Run time
Check wasm32+atomics	1m 54s
Check wasm32 + wasm-bindgen	2m 23s
cargo-deny aarch64-apple-darwin	1m 44s
cargo-deny aarch64-linux-android	36s
cargo-deny i686-pc-windows-gnu	36s
Format + check + test	8m 51s
android	24s
cargo-deny i686-pc-windows-msvc	1m 25s
cargo-deny i686-unknown-linux-gnu	2m 42s
Check Windows	1m 34s
cargo-deny wasm32-unknown-unknown	5m 27s
ios	4m 36s
cargo-deny x86_64-apple-darwin	52s
cargo-deny x86_64-pc-windows-gnu	36s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	40s
cargo-deny x86_64-unknown-linux-musl	34s
cargo-deny x86_64-unknown-redox	40s
	36m 12s

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