cargo fmt: use hardtabs

since it does not support hard-whitespaces its the only way to make whitespaces consisitent and checked

invalidstring/src/lib.rs

@@ -1,8 +1,8 @@
 /// uses unsafe to postfix the string with invalid utf8 data
 pub fn invalid_utf8(prefix: &str) -> String {
-    let bytes = b"\xc3\x73";
+	let bytes = b"\xc3\x73";
 
-    unsafe {
-        format!("{}{}", prefix, std::str::from_utf8_unchecked(bytes))
-    }
+	unsafe {
+		format!("{}{}", prefix, std::str::from_utf8_unchecked(bytes))
+	}
 }