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Junk symbols

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Text that you copy from the internet often contains junk symbols. Examples are double whitespace, the symbol "minus" instead of a dash, single quotes instead of double ones, or single punctuation marks (dot, comma, exclamation mark, or question mark).

You need to write a small program that points out these junk symbols. If any of the cases are found in the input string, print the corresponding message:

  • "Double whitespace"
  • "Minus symbol" - (dash is —)
  • "Single quotes" '
  • "Single mark" .,?!

For the minus-dash problem, let's make a deal that the minus symbol means a negative number, and it's written without whitespace: -1, -0.5, -433. On the other hand, the dash symbol has whitespace on both sides: — .

For the single-mark problem, remember that punctuation marks are placed right next to another symbol:

  • single-mark problem, — correct
  • single-mark problem , — not correct

And let's think that a string doesn't contain words like it's, where a single quote is a part of the word.

Sample Input 1: 

Hello World!

Sample Output 1:

Write a program in Go
package main

import (
"fmt"
"strings"
"bufio"
"os"
)

func main() {
var source string
scanner := bufio.NewScanner(os.Stdin)
if scanner.Scan() {
source = scanner.Text()
}

if strings.Contains(?, ?) {
fmt.Println("Double whitespace")
}

// add the same checks for other cases here or below this comment!
}
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