strxcat

strxcat can be considered as a safe replacement for strlcat.
* Another c-string concatenation function.
* strxcat only affects dst if there is enough space to copy src at the end of dst. It null-terminates dst. Otherwise, strxcat doesn't touch dst.

Algorithm:
This function traverses dst looking for the null character '\0'. If it's found it starts to copy src to dst+dst_len, including the '\0' character. strxcat doesn't set the remaining positions (if any) in dst to '\0'