previous declaration of ‘function’ was here in C [duplicate]

http://www.kernel.org/doc/man-pages/online/pages/man3/getline.3.html

getline already exists in stdio.h. That is why you are getting the error. Change the function name to something else like getline_my.

Also, you are comparing a character with a string in line 16. It should be
if(c == '\n')

NOT

if(c == "\n")

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