title: C Library Find Difference Between Two Arrays
body: <p>Given 2 arrays I need a C Function/Library that will find what's different between 2 arrays.</p>
  
  <pre><code>array1[] ={"a","b","c","e"}
  array2[] ={"a","c","e"}
  </code></pre>
  
  <p>and the function should return</p>
  
  <pre><code>{"b"}
  </code></pre>
  
  <p>These 2 arrays are <b>guaranteed</b> to be sorted, but not the same size. I just need this function to be fast.</p>