Handle escaped backslashes before closing quote (#480)

Author: fvictorio

package-lock.json

@@ -81,7 +81,7 @@
     "escape-string-regexp": "^4.0.0",
     "prettier": "^2.2.1",
     "semver": "^7.3.5",
-    "solidity-comments-extractor": "^0.0.6",
+    "solidity-comments-extractor": "^0.0.7",
     "string-width": "^4.2.2"
   }
 }

package.json

@@ -92,4 +92,13 @@ interface Comments10 {
   ) /* comment outside the parameters */ external;
 
   function someOtherFunction(/* checking for Block comment */) external;
-}
+}
+
+contract Comments11 {
+  string a = "\\";
+  string b = '\\';
+
+  function f() public {
+    // this should not be removed
+  }
+}

tests/Comments/Comments.sol

@@ -101,6 +101,16 @@ interface Comments10 {
 
   function someOtherFunction(/* checking for Block comment */) external;
 }
+
+contract Comments11 {
+  string a = "\\\\";
+  string b = '\\\\';
+
+  function f() public {
+    // this should not be removed
+  }
+}
+
 =====================================output=====================================
 pragma solidity ^0.4.24;
 
@@ -221,5 +231,14 @@ interface Comments10 {
     ) external;
 }
 
+contract Comments11 {
+    string a = "\\\\";
+    string b = "\\\\";
+
+    function f() public {
+        // this should not be removed
+    }
+}
+
 ================================================================================
 `;