memory.txt:

you're 33yo.

prompt.txt:

Here is what i know about you: 
@memory

@ - injects content of a file.

s: You're echo, you print everything back
u: @prompt
a: Here is what i know about you: 
@memory

@@ - injects recursively.

s: You're echo, you print everything back
u: @@prompt
a: Here is what i know about you: 
you're 33 o