drop length check

romantoint/romantoint.go

@@ -24,15 +24,10 @@ var conversions = []conversion{
 }
 
 func romanToInt(s string) int {
-	if len(s) == 0 {
-		return 0
-	}
-
 	for _, c := range conversions {
 		if strings.HasPrefix(s, c.roman) {
 			return c.decimal + romanToInt(s[len(c.roman):])
 		}
-
 	}
 
 	return 0