1 files changed, 7 insertions, 0 deletions

diff --git a/2022/03/common.rs b/2022/03/common.rs
new file mode 100644
index 0000000..cf323f5
--- /dev/null
+++ b/2022/03/common.rs
@@ -0,0 +1,7 @@
+pub fn value(c: char) -> i64 {
+    match c {
+        'a'..='z' => (c as i64) - ('a' as i64) + 1,
+        'A'..='Z' => (c as i64) - ('A' as i64) + 27,
+        _ => panic!("Error: unexpected character '{}'", c)
+    }
+}