Fix the ARM64 assembly program at /app/resta.s so that it correctly computes 5 - 3 and prints 5 - 3 = 2…

Fix the ARM64 assembly program at /app/resta.s so that it correctly computes 5 - 3 and prints 5 - 3 = 2…: a task in rts-1k-rootless-apptainer: RTS-1K: offline rootless Apptainer release (Harbor dataset). What the agent is asked, how it is graded, what it runs in, and its files.