[c-prog] ask for help about c string

[xiaoxinchen1989]

this is a programe ,could you tell me why it can't run?Thank you! 
 
 
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main()
{
    int n=10;
    char* s=(char*)malloc(sizeof(char)*100);
    char* s2=(char*)malloc(sizeof(char)*100);
    itoa(n,s,10);
    s2="*";
    strcat(s2, s);
    printf("%s", s2);
    system("pause");
    return 0;
}



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