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char* strstr(const char* s1, const char* s2)
{
if(s1 == NULL || s2 == NULL)
return NULL;
while(*s1)
{
while(1)
{
int i = 0;
if(s2[i] == NULL)
return (char*)s1;
if(s2[i] != s1[i])
break;
i++;
}
s1++;
}
return NULL;
}
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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using  ......