by using pointer/ argc/argvull safety/ and other pointer types. not strlen function and it will be nice if you gave complex answer whit every detail by word.

2. Write a program to check email address validity Tip: Parse the string and count the special characters like '@', '.'. There are only one '@' and at least one 'i' character. More checks (optionally): the first and last characters cannot be '@'or',' cannot be an 'i' or '@' beside an '@' cannot be a '@' or ',' beside an',' suggested libc functions: printf()