Remove redundant substring

src/main.cpp

@@ -147,7 +147,6 @@ void autonomous(void) {
     instructions = instructions.substr(y + 1);
     y = instructions.find(" ", 5);
     pos = strtod(instructions.substr(0, y).c_str(), NULL);
-    instructions = instructions.substr(y + 1);
     TiltMotor.rotateTo(pos, degrees, vel, velocityUnits::pct, false);
     wait(20, msec);
   }