Exercise 1.18 - Remove trailing blanks and tabs


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



In the removetrail function, we go to the very end of the line and the trace back to the find the character which is not a space, tab and then replace it with 0. This eliminates the trailing blanks in a line. For the empty lines whose length is 0, we simply skip that from output and thus removing it.