As of yet untitled language (so new noncompetitive), 9 bytes
hD_RQ:Q|J
You can find the source code here, language is completely unstable (first test challenge for it) so don't expect it to work in the future (commit 7)
This is a stack based language with functions that add and remove objects from the stack. There are currently 2 stack manipulation commands: D(duplicate the top of the stack N times) and R(rotate the top N items on the stack)
Explanation:
- autoassign Q = eval_or_not(input()) (string)
h - imp_eval_input()+1
D - duplicate(^)
_ - neg(^)
R - rotate(^)
Q: - Q[^:^]
Q| - Q[0], Q[-1]
J - "".join(all)
