2016-day04: caesar shift algo, validating checksum

algos/caesar-shift.go

@@ -0,0 +1,15 @@
+package algos
+
+// CaesarShift performs a forwards caesar shift of a given shiftAmount
+func CaesarShift(in string, shiftAmount int) string {
+	var result string
+	for _, char := range in {
+		// char to ascii number
+		ascii := int(char) - int('a')
+		ascii += shiftAmount
+		ascii %= 26
+		ascii += int('a')
+		result += string(rune(ascii))
+	}
+	return result
+}