occurence -> occurrence
Closes #7566
/* Search the substring needle,needlelen into string haystack,haystacklen
* Strings don't need to be terminated by a '\0'.
* Similar of OSX/Linux memmem (not available on Visual Studio).
- * Return position of beginning of first occurence or NULL if not found
+ * Return position of beginning of first occurrence or NULL if not found
*/
static const char *c_memmem(const void *haystack, size_t haystacklen,
const void *needle, size_t needlelen)