Fix errors

catlaser_0.6.ino

@@ -73,19 +73,19 @@ void moveLaser(int x, int y) {
 void moveRequest(String req) {
   int x;
   int y;
-  const paramQIdx = req.indexOf('?');
-  const paramAtIdx = req.indexOf('&');
+  const int paramQIdx = req.indexOf('?');
+  const int paramAtIdx = req.indexOf('&');
   const String valA = req.substring(paramQIdx + 1, paramAtIdx);
   const String valB = req.substring(paramAtIdx+1);
 
   if (valA.startsWith('x=') && valA.length < 6) {
-    string tmpX = valA.substring(2);
-    string tmpY = valB.substring(2);
+    String tmpX = valA.substring(2);
+    String tmpY = valB.substring(2);
     x = tmpX.toInt();
     y = tmpY.toInt();
   } else {
-    string tmpY = valA.substring(2);
-    string tmpX = valB.substring(2);
+    String tmpY = valA.substring(2);
+    String tmpX = valB.substring(2);
     x = tmpX.toInt();
     y = tmpY.toInt();
   }