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change usage and rewrite subjects

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Hamza elkhatri 2 years ago
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  1. 24
      subjects/swapname/README.md

24
subjects/swapname/README.md

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### 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.
- The first argument should contain only alphabetic characters and spaces and only two word, if not, print `"Error\n"`
- Print the result with a new line at the end (`'\n'`).
- Trim space in the beginning and end of the string
Write a program that takes a first and last name as one argument and swaps them.
- If there is more than one argument, nothing should be printed.
- The argument should contain only alphabetic characters and spaces and only two words, if not, you have to print `"Error\n"`
- The result must be followed with a new line at the end (`'\n'`).
- Trim any extra space in the beginning or end of the string.
### Usage
```console
$ go run . | cat -e
$ go run . "Hello World" "Hello World" | cat -e
$ go run . "Hello World" | cat -e
World Hello$
$ go run . "James Carl" "Peter Lab" | cat -e
$ go run . "ROB carlos" | cat -e
carlos ROB$
$ go run . "He2 $%hello" | cat -e
Error$
$ go run . " Hello World " | cat -e
World Hello$
$ go run . "Hello World Hello" | cat -e
$ go run . " JULIE BIRD " | cat -e
BIRD JULIE$
$ go run . "Carl Jon Mic" | cat -e
Error$
$ go run . "Hello" | cat -e
$ go run . "ROB" | cat -e
Error$
```

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