cleanup

helper/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+nom.workspace = true

helper/src/lib.rs

@@ -0,0 +1,5 @@
+use nom::{character::complete::digit1, combinator::map, IResult};
+
+pub fn integer(input: &str) -> IResult<&str, u64> {
+    map(digit1, |d: &str| d.parse::<u64>().unwrap())(input)
+}