C27 : Manipulate strings(using string library functions)

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//Program to manipulate string using library functions.

#include<stdio.h>
#include<conio.h>
void main()
{
char s1[20];
char s2[20];
int l;
clrscr();
printf("Enter two strings\n");
scanf("%s%s",s1,s2);
l=strlen(l);
printf("Length of string=%d\n",l);
strcat(s1,s2);
printf("Combined string=%s",s1);
getch();
}
---------------------------------------------------------------
Output
Enter two strings
Welcome
C
Length of the string=7
Combined string=Welcome C
===============================================

//Error in output
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