C string append

Question

I want to append two strings. I used the following command:

new_str = strcat(str1, str2);

This command changes the value of str1

Answer 1

I needed to append substrings to create an ssh command, I solved with sprintf (Visual Studio 2013)

char gStrSshCommand[SSH_COMMAND_MAX_LEN]; // declare ssh command string

strcpy(gStrSshCommand, ""); // empty string

void appendSshCommand(const char *substring) // append substring
{
  sprintf(gStrSshCommand, "%s %s", gStrSshCommand, substring);
}