Work clippy

[mizar]

Dependent PR:
#109 Remove the hand-made input!

Related PR:
#108 Workaround for Japanese Windows environment
#112 u32 modulo fix

fixes:
https://rust-lang.github.io/rust-clippy/master/index.html#bool_to_int_with_if
https://rust-lang.github.io/rust-clippy/master/index.html#implicit_saturating_sub

[mizar]

• From::<bool> for i32, From::<bool> for usize was stabilized in Rust 1.28.0
  • https://doc.rust-lang.org/std/primitive.i32.html#impl-From%3Cbool%3E-for-i32
  • https://doc.rust-lang.org/std/primitive.usize.html#impl-From%3Cbool%3E-for-usize
• saturating_sub was stabilized in Rust 1.0.0
  • https://doc.rust-lang.org/std/primitive.usize.html#method.saturating_sub
  • https://doc.rust-lang.org/src/core/num/uint_macros.rs.html#1044-1062

[qryxip]

OK. The CI has been fixed. Merging.