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27-1

#include<iostream.h>
#include<stdio.h>

char *myStrStr(const char *s1, const char *s2)
{
	for (; *s1 ; s1++) {	// avvale jaayi ke donbaale s2 migardim
		char *tempS1 = (char *)s1;
		char *tempS2 = (char *)s2;
		while (*tempS2) {
			if (*tempS1!=*tempS2)
				break;
			tempS1++;
			tempS2++;
		}

		if (*tempS2 == 0)
			return (char *)s1;

	}
}

void main ()
{
	char matn[1024]="mohalreza aaabaaaa va aaaa mahmood be alireza salam kardand\
lili";
	char str[80] = "ali";

	myStrStr(matn, str);
}

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