single line comments.

src/main/java/ch/fritteli/gombaila/domain/lexer/Lexer.java

@@ -50,7 +50,12 @@ public class Lexer {
             } else if (c == '*') {
                 this.handleSimple(TokenType.MULT, line, column);
             } else if (c == '/') {
+                if (this.content.peekNext().exists(n -> n == '/')) {
+                    this.content.next();
+                    this.handleLineComment();
+                } else {
                     this.handleSimple(TokenType.DIV, line, column);
+                }
             } else if (c == '%') {
                 this.handleSimple(TokenType.MOD, line, column);
             } else if (c == '^') {
@@ -107,6 +112,15 @@ public class Lexer {
         this.appendToken(new Token(tokenType, line, column));
     }
 
+    private void handleLineComment() {
+        while (this.content.peekNext().exists(next -> next != '\n')) {
+            this.content.next();
+        }
+        if (this.content.peekNext().exists(next -> next == '\n')) {
+            this.content.next();
+        }
+    }
+
     private void appendToken(@NotNull final Token token) {
         this.tokens = this.tokens.append(token);
     }

src/main/resources/gombaila/simple.gb

@@ -1,7 +1,9 @@
 let x = 1;
 if (x) {
-    x = 99;
+//    x = 99;
 } else {
     x = 12;
 }
+// comment
 exit(x);
+// comment