Add printable CLI to strip unwanted characters from email.

src/bin/printable.rs

@@ -0,0 +1,27 @@
+use std::{io, io::Read};
+
+use regex::Regex;
+
+fn main() -> io::Result<()> {
+    let re = Regex::new("[^[[:print:]]\n]").expect("invalid regex");
+    let mut buffer = String::new();
+    io::stdin().read_to_string(&mut buffer)?;
+    let buffer = re.replace_all(&buffer, "");
+
+    let mut last_c = 0;
+    for l in buffer.lines() {
+        let c = l
+            .as_bytes()
+            .iter()
+            .filter(|b| match b {
+                b' ' | b'\t' => false,
+                _ => true,
+            })
+            .count();
+        if !(c == 0 && last_c == 0) {
+            println!("{l}");
+        }
+        last_c = c;
+    }
+    Ok(())
+}