if its c major, Id imagine it start(lowest to highest) like GCEC and end either wth GBDG or GBDB.Ig I'd prolly resolve it with a CGEC. As for what rules it breaks, Idrktbh.
Now, appoggiatura is a non-chord tone that is approached by a leap and resolved by step (usually downward) to a chord tone. It typically occurs on the beat, creating a strong dissonance.
But I'm asking for 2 appoggiaturas, this is rare and tricky (and fun): Multiple dissonances must resolve clearly. They must not interfere with the cadential structure. Parallel motion and bad intervals (5ths/8ves) must be avoided.
Correct, a is a major 2nd above the base = dissonance.
An appoggiatura is an accented dissonance that must resolve by step. In common‑practice cadences you want those dissonances.
Appoggiaturas are non‑chord tones on the beat. The A (in tenor) is treated just like a 6–5 or 4–3 suspension: you expect it to clash, so long as it then drops by step into a consonance (G).
You approach A by leap or skip from the previous chord, and then resolve downward to G on the next strong subdivision. Likewise, the soprano’s C (a dissonant 4th above G) falls to B.
As long as there’s no parallel 5ths/8ves and each dissonance resolves cleanly, the “harshness” is the expressive tension you need for cadence.