Add basic Input validation for if user enters digit or 'q' as a choice
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Cargo.toml
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8
Cargo.toml
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[package]
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name = "math-tool"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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