1 files changed, 6 insertions, 9 deletions

diff --git a/caesar.go b/caesar.go
index d62a26e..191c5b8 100644
--- a/caesar.go
+++ b/caesar.go
@@ -21,16 +21,13 @@ type RuneRange struct {
 	End rune
 }
 
-// Contains checks whether r is in the rune range.
-func (rr RuneRange) Contains(r rune) bool {
+// contains checks whether r is in the rune range.
+func (rr RuneRange) contains(r rune) bool {
 	return r >= rr.Start && r <= rr.End
 }
 
-// Shift shifts r by d within the range, modulo the size of the range.
-func (rr RuneRange) Shift(r rune, d int) rune {
-	if !rr.Contains(r) {
-		return r
-	}
+// shift shifts r by d within the range, modulo the size of the range.
+func (rr RuneRange) shift(r rune, d int) rune {
 	return rr.Start + (r - rr.Start + rune(d)%(rr.End-rr.Start))
 }
 
@@ -62,8 +59,8 @@ type shiftFunc func(rune) rune
 func (c Coder) shifter(delta int) shiftFunc {
 	return func(r rune) rune {
 		for _, rr := range c.Ranges {
-			if rr.Contains(r) {
-				return rr.Shift(r, delta)
+			if rr.contains(r) {
+				return rr.shift(r, delta)
 			}
 		}
 		return r