[IPrototypeI]

I hope you know what argument type mismatch (argument 1) means .
you used fread wrong where is the file directory

while(fread(contact, str)) <= wrong

while(fread(file, str)) <= right

the same there
if(strcmp(file, temp, true) == 0)

you can`t use file there use str you get the which you read out of the file in this string

and rethink more about your code i don't understand what do you want to check.