Duplicate false negatives and profanities break censoring

[TwiN]

Describe the bug

When a string has two false negatives and two profanities, the string is not censored properly.

What do you see?

println(goaway.Censor("document fuck document fuck"))

outputs

document **** ****ment fuck

For verbosity, note that by default, document is a false positive (meaning it should not be censored) and fuck is a profanity.

What do you expect to see?

The output should be:

document **** document ****

List the steps that must be taken to reproduce this issue

1. Uncomment the test case that can be found at

   go-away/goaway_test.go

   Lines 148 to 152 in 3bf4c7a

   	//{
   	// input: "document fuck document fuck", // FIXME: This is not censored properly
   	// expectedOutput: "document **** document ****",
   	// expectedOutputWithoutSpaceSanitization: "document **** document ****",
   	//},

2. Run the tests
3. Note how the new test case is failing

Version

v1.6.3

Additional information

I found this out while investigating #30