title: Inserting char string into another char string
body: <p>Ok, so I have a char stringA and char stringB, and I want to be able to insert stringB into stringA at point x.</p>
  
  <pre><code>char *stringA = "abcdef";
  char *stringB = "123";
  </code></pre>
  
  <p>with a product of <code>"ab123cdef"</code></p>
  
  <p>does anyone know how to do this? Thanks in advance</p>