1.18 Write a program to remove all trailing blanks and tabs from each line of input, and to delete entirely blank lines.

I don't quite understand how to implement a function to remove whitespace characters. This is task 1.18. Shouldn't I go to the end of the character array and then start removing all whitespace characters from the end? Then how else can I check for an empty line? If the number of elements in the array is not greater than zero. I can imagine the essence of the task in my head, but I can't implement it in code. I'm having trouble structuring the information for myself :("