Update README.md

2 years ago · 4fc920469f
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 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 a string, the program should print `"Error\n"`.
+- 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'`).