title: Converting a hexadecimal string to a decimal integer
body: <p>I'm writing a Rust program that reads off of an I2C bus and saves the data. When I read the I2C bus, I get hex values like <code>0x11</code>, <code>0x22</code>, etc.</p>
  
  <p>Right now, I can only handle this as a string and save it as is. Is there a way I can parse this into an integer? Is there any built in function for it?</p>