feat: add initial ignore unsafe utf8

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "anyhow"
+version = "1.0.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
+
+[[package]]
+name = "fexcel"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+]

Cargo.toml

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+[package]
+name = "fexcel"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.100"

src/main.rs

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+use std::io::{Read, Write};
+
+use anyhow::Context;
+
+fn main() -> anyhow::Result<()> {
+    let mut input = std::io::stdin().lock();
+    let mut output = std::io::stdout().lock();
+
+    let mut output_bytes = Vec::new();
+    input
+        .read_to_end(&mut output_bytes)
+        .context("could not read stdin")?;
+
+    let safe_utf8_content = String::from_utf8_lossy(&output_bytes);
+
+    output.write_all(safe_utf8_content.as_bytes())?;
+    output.flush()?;
+
+    Ok(())
+}