This Alternative combiner is basically a C++ code, which has the sole purpose of combining two txt files line by line alternatively in a way such as:
file1.txt
line1
line2
line3
line4
_______________
file2.txt
a
b
c
d
The result ( file3.txt )
line1
a
line2
b
line3
c
line4
d
.
# The code is kinda messy, but does the job. Feel free to use and alter as you like.