commented code

core/text.go

@@ -17,6 +17,7 @@ func removeCharacters(input string, characters string) string {
 }
 
 // https://stackoverflow.com/questions/34839659/how-can-i-easily-get-a-substring-in-go-while-guarding-against-slice-bounds-out
+// get a substring of size "max" from a string "s"
 func maxString(s string, max int) string {
 	if len(s) > max {
 		r := 0
@@ -45,6 +46,7 @@ func stripEmoji(msg string) string {
 	}
 }
 
+// sanitize received message for text-to-speech
 func prepareTTSMessage(msg string) string {
 	t1 := maxString(msg, 300)
 	t2 := stripEmoji(t1)