search phonebook incomplete

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 100
typedef struct
{
    char fn[100];
    char ln [100];
    char no[100];
}contact;
void search(char *key, int type, contact entry);
int main()
{
    contact i,t1,t2,t3;
    contact entry[500];
    for (i=0;i<n;i++)
    {
        gets(t1.fn);
        gets(t1.ln);
        gets(t1.no);
        gets(t2.fn);
        gets(t2.ln);
        gets(t2.no);
        gets(t3.fn);
        gets(t3.ln);
        gets(t3.no);
    }
    char *key;
    int type,value;
    puts("How do you want to search?\n0 - Search by first name.\n1 - Search by last name.\n2 - Search by number.");
    do
    {
        scanf("%d",&value);
        if (value==0||value==1||value==2)
        search (key,value,entry);
    }
    while (value>2);
}
void search(key[100],type,entry)
{
    int flag=0,i;
    if (type==0)
    {
        for (i=0;i<=3;i++)
            if (strcmp(*(cont+i),key)=0)
                found=1;
    }
    if (type==1)
    {
        for (i=0;i<=3;i++)
            if (strcmp(*(cont+i),key)=0)
                found=1;
    }
    if (type==2)
    {
        for (i=0;i<=3;i++)
            if (strcmp(*(cont+i),key)=0)
                found=1;
    }
}