Fix: last quotation mark of string next string

The lexer wasn't skipping the last quotation mark of a string, which meant that this quotation mark was being considered as the start of a second string.
This resulted in exceptions that the string wasn't terminated if a second token was requested for simple strings like "\"test\""

Author: QuickWrite

src/main/kotlin/lexer/StringJSONLexer.kt

@@ -77,6 +77,8 @@ class StringJSONLexer(private val content: CharSequence) : JSONLexer {
             throw LexerException("String wasn't terminated") // TODO: Better error handling
         }
 
+        position++
+
         return JSONLexeme(JSONLexemeType.STRING, builder.toString())
     }
 

src/test/kotlin/lexer/StringJSONLexerTest.kt

@@ -77,7 +77,9 @@ class StringJSONLexerTest {
         val inputs = arrayOf("\"\"", "\"Hello World\"")
 
         inputs.forEach {
-            assertEquals(JSONLexeme(JSONLexemeType.STRING, it.substring(1, it.length - 1)), StringJSONLexer(it).getNext())
+            val lexer = StringJSONLexer(it)
+            assertEquals(JSONLexeme(JSONLexemeType.STRING, it.substring(1, it.length - 1)), lexer.getNext())
+            assertEquals(JSONLexeme(JSONLexemeType.EOF), lexer.getNext())
 
             // Add padding
             assertEquals(JSONLexeme(JSONLexemeType.STRING, it.substring(1, it.length - 1)), StringJSONLexer(" \t$it").getNext())