public/subjects/swapname

swap-name

Instructions

Write a program that takes two words in the first argument and swaps them.

• If the number of arguments is not 2, nothing should be printed.
• If the first argument is not an alphanumeric characters, the program should print "Error\n".
• Skip the spaces in the first of the two words.
• Print the result with a new line at the end ('\n').

Usage

$ go run . | cat -e
$ go run . "Hello World" "Hello World" | cat -e
$ go run . "Hello World" | cat -e
World Hello$
$ go run . "He2 $%hello" | cat -e
Error$
$ go run . "   Hello World" | cat -e
World Hello$
$ go run . "Hello World   " | cat -e
Error$
$ go run . "Hello World Hello" | cat -e
Error$