Function aoc::y15d01::y15d01p1

pub fn y15d01p1(input: &str) -> i32

The solution for part one of the day one challenge.

Given the input as a string we loop through the characters and either add one or subtract one from a counter that starts at zero depending on if the character is a (, or a ), respectively.

Example

let input = "(()))((\n"; // probably read this from the input file...
assert_eq!(y15d01p1(input), 1);