caesar's little secret

The string in .data was encrypted the way Julius Caesar liked it: every letter shifted three places forward, wrapping around the end of the alphabet. Decode it in place and print the result.

Walk the bytes with ldrbLoad byte into Wt.. For each lowercase letter, shift back by three; if that falls below 'a', add 26 to wrap around. Store the decoded byte back with strbStore low byte of Wt. and leave the spaces alone. The printf at the bottom prints the string you repaired.

what is checked

• the decoded message is printed
• the program exits cleanly
• the decode happens byte by byte in memory (ldrbLoad byte into Wt. and strbStore low byte of Wt., no pasting the answer into .data)