Laser transmitter transmitts the whole alphabet instead of a single character

Yeah I corrected those missing =
thanks for pointing that out.

As of now, I still dont perfectly understand the difference between arrays and strings in thas manner and am far away from understanding why and how to compare them.

But according to my understanding I have to breal the array (or string) up into single characters for my transmission process right?

Anyways, right now it does what it is supposed to, it accepts long messages, breaks them down into the single characters and transmitts them one at a step.
Thanks for your time and help.