extraction of external edges coordinates from g code files

hi, I extracted the g code corresponding to the parts to be printed from the 3d printing software. the parts are a, b, c, which are named in the file g code, and first with MATLAB I have to declare which of the three parts to analyze, that is in my case part c and then I have to extract the coordinates of the outer edges for all the layers of the part.

To be more specific, I want to extract the X, Y, E coordinates referring to WALL OUTER in the file in question:

for each layer I have

; LAYER: number of the layer

; TYPE: WALL-OUTER

; MESH: c.stl

and immediately after the coordinates of the edge of the considered layer.

I attach the g code file to the question

p.s. in file c = lattice1, dim elem 0.98, rotaz 30