WAP that look-alike of the function strlen( )

/*WAP that look-alike of the function strlen( ) */

#include<stdio.h>
#include<conio.h>
main( )
{
 char  arr[ ] = "codezworld" ;
 int  len1, len2 ;

 len1 = xstrlen ( arr ) ;
 len2 = xstrlen ( "A blog of programs" ) ;

 printf ( "\nstring = %s length = %d", arr, len1 ) ;
 printf ( "\nstring = %s length = %d", "A blog of programs", len2 ) ;
}

xstrlen ( char  *s )
{
 int  length = 0 ;

 while ( *s != '\0' )
 {
  length++ ;
  s++ ;
 }

 return ( length ) ;
}