title: Call by reference of a string with double pointer
body: <p>Hi guys I got some problems with using a function with a reference to a string as argument. I read that you should use e double pointer for this, but I can't get it to work.
  This is (partly) my code.</p>
  
  <pre><code>enum errCode { ERR_NONE = 0, ERR_EMPTY, ERR_FULL, ERR_MEM, ERR_INIT, ERR_COMMAND, ERR_UNDEFINED };
  typedef enum errCode ErrCode;
  
  typedef enum {
      no = 0, add, del, src, show, exit
  } Command;
  
  int main(void) {
      char stringval[50];
      char stringval2[50];
      ErrCode err;
      Command currentCommand = no;
  
      printf("Enter a command\n");
  
      if (fgets(stringval, 50, stdin) != NULL) {
          char *p;
          if ((p = strchr(stringval, '\n')) != NULL)
              *p = '\0';
      }
  
      ErrHandler(
              extractCommand(&amp;currentCommand, stringval, &amp;stringval2)
              );
  
      printf("stringval 2 = %s.\n", stringval2);
  
      return 0;
  }
  
  ErrCode extractCommand(Command *command, char *inputString, char **outputString) {
  
      char *strTemp;
      char *strTemp2;
  
      //Get the first word of the string
      strTemp = strtok(inputString, " ");
  
      strTemp2 = strtok(NULL, " ");
      *outputString = strTemp2;
  
      //Check if it equals a command
      if (strcmp(strTemp, "exit") == 0) {
          *command = exit;
          return ERR_NONE;
      } else if (strcmp(strTemp, "add") == 0) {
          *command = add;
          return ERR_NONE;
      } else if (strcmp(strTemp, "del") == 0) {
          *command = del;
          return ERR_NONE;
      } else if (strcmp(strTemp, "src") == 0) {
          *command = src;
          return ERR_NONE;
      } else if (strcmp(strTemp, "show") == 0) {
          *command = show;
          return ERR_NONE;
      } else {
          *command = no;
          printf("%s", strTemp);
          return ERR_COMMAND;
      }
  }
  </code></pre>
  
  <p>This is what my output looks like:</p>
  
  <pre><code>Enter a command
  add this is a test
  stringval 2 = z˜ˇøÀo‡èK‡èT¯ˇø.
  </code></pre>
  
  <p>I obviously want to have the second word of the inputted string, but I'm doing something wrong.
  Thx for the help!</p>