Why doesn't the program succeeds all of the 4 subtasks? C PROGRAM

So i have a program which filters a file containing "emails" in a single line, i link you to the exercise (it is a pdf) https://training.olinfo.it/#/task/ioit_spam/statement so my problem is that it doesn't accomplish all of the 4 tasks but from my tests (i've created a file with 1000 emails) it should correctly and pass all of its cases. i don't know if it's a problem of the corrector on the site (you need to register to test the program) but i link here the scoring (it should score 100 in theory) it might be a problem of the corrector? https://imgur.com/a/QmeY5 and the source file is this https://pastebin.com/iVPXUjxb
Thanks to everyone answering i hope i've made the question clear, the program works in my machine, it can even scan 10000 emails if i'd want to, infact i've tried filtering a 8mb file containing 1000 emails with 1000 words each.
this is the link for the 1000 emails input file https://drive.google.com/file/d/1f9OWkzZ_i9T8s6BcNIq5hXqBogCR2Dcj/view?usp=sharing