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The header file #include<string.h> has not been explained enough. I found this error in the C tutorial -> Structures -> What about strings in structures? -> example 2 that shows the use of strcpy() to copy a string but this will work only if #include<string.h> is used but not explained but it is only found in the "try it" code kindly add a tip about the #include<string.h> header file and why it is used or even better a section on string functions. If at all possible, adding file handling and memory management sections would be great too Thank you very much!