Why are my string tokens not getting printed? (strtok)

In this code, I’m taking a credit card number (which is datatype char) that has 12 digits that have spaces (eg: 1254 6789 4331). I want to split the string where the spaces are but when I ran the code on the command prompt, only the first 4 digits get printed (eg: 1254). There were no errors on the command prompt so I’m a little confused about why the code is not working. I would appreciate it if someone could help me, Thanks!

Code:

    '''

    #include<stdio.h>
    #include <string.h>

    int main() {
       char string[20];
       printf("Please enter your credit card number: ");
       scanf("%s",string);
       // Extract the first token
       char * token = strtok(string," ");
       // loop through the string to extract all other tokens
       while( token != NULL ) 
       {
          printf( " %s\n", token ); //printing each token
          token = strtok(NULL," ");
       }

       return 0;
    }

    '''

>Solution :

Use

       scanf("%15[^\n]",string);

hope it helps