diff --git a/src/main.rs b/src/main.rs
index 101f24a..ad70309 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,20 @@
 use anyhow::Result;
 use std::io::stdin;
 
-type Grid = Vec<Vec<char>>;
+type Row = Vec<char>;
+type Grid = Vec<Row>;
+
+fn roll_left(row: &mut Row) {
+
+}
+
+fn roll_column_up(grid: &mut Grid, col: usize) {
+
+}
+
+fn roll_up(grid: &mut Grid) {
+
+}
 
 fn main() -> Result<()> {
     let mut grid: Grid = vec![];