trailing whitespace was useful in the last problem. Refactored so it will only remove one trailing newline if present.

Author: devries

src/day06/solution.gleam

@@ -37,17 +37,10 @@ pub fn solve_p1(lines: List(String)) -> Result(String, String) {
 
 // Part 2
 pub fn solve_p2(lines: List(String)) -> Result(String, String) {
-  let line_length =
-    list.fold(lines, 0, fn(acc, v) { int.max(acc, string.length(v)) })
-
   lines
   |> list.map(fn(line) {
-    let new_line =
-      string.to_graphemes(line)
-      |> list.reverse
-
-    let n = line_length - list.length(new_line)
-    list.append(list.repeat(" ", n), new_line)
+    string.to_graphemes(line)
+    |> list.reverse
   })
   |> list.transpose
   |> list.filter(fn(l) {

src/internal/aoc_utils.gleam

@@ -13,8 +13,11 @@ pub fn read_lines(
 ) -> Result(List(String), simplifile.FileError) {
   use content <- result.map(simplifile.read(from: filepath))
 
-  content
-  |> string.trim_end
+  // Drop one trailing newline if present
+  case string.ends_with(content, "\n") {
+    False -> content
+    True -> string.drop_end(content, 1)
+  }
   |> string.split("\n")
 }