account for shared starting and ending runes

day01.go

@@ -35,31 +35,31 @@ func findtextdigits(line string) []rune {
 
 		if strings.HasPrefix(line, "one") {
 			d = append(d, '1')
-			line = line[3:]
+			line = line[2:]
 		} else if strings.HasPrefix(line, "two") {
 			d = append(d, '2')
-			line = line[3:]
+			line = line[2:]
 		} else if strings.HasPrefix(line, "three") {
 			d = append(d, '3')
-			line = line[5:]
+			line = line[4:]
 		} else if strings.HasPrefix(line, "four") {
 			d = append(d, '4')
-			line = line[4:]
+			line = line[4:] // skip len("four") entirely because no digits start with 'r'
 		} else if strings.HasPrefix(line, "five") {
 			d = append(d, '5')
-			line = line[4:]
+			line = line[3:]
 		} else if strings.HasPrefix(line, "six") {
 			d = append(d, '6')
-			line = line[3:]
+			line = line[3:] // skip len("six") entirely because no digits start with 'x'
 		} else if strings.HasPrefix(line, "seven") {
 			d = append(d, '7')
-			line = line[5:]
+			line = line[4:]
 		} else if strings.HasPrefix(line, "eight") {
 			d = append(d, '8')
-			line = line[5:]
+			line = line[4:]
 		} else if strings.HasPrefix(line, "nine") {
 			d = append(d, '9')
-			line = line[4:]
+			line = line[3:]
 		} else {
 			line = line[1:]
 		}