WAP to concatenate a string to another string.

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

void concat(char *s1,char *s2);

main()
{
      char str1[20],str2[20];
      printf("enter two strings");
      scanf("%s",str1);
      scanf("%s",str2);

      concat(str1,str2);

printf("\n");
 system("pause");
}

void concat(char *s1,char *s2)
{
    char str[100]={0};
    int i;
    i=0;
    while(*s1!='')
    {
      str[i]=*s1;
      i++;
      s1++;
    }

    while(*s2!='')
    {
      str[i]=*s2;
      i++;
      s2++;
    }

    printf("%s",str);

}
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