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Segmentation fault (core dumped)

juvelover (14)
can sameone help to know why when I insert the first and last and phone number my code dumped
//////////////////////////////
myRolodex Command: I
Enter card: name phone
slex john 415 555 4444

Segmentation fault (core dumped)
//////////////////////////////////

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  P#include<stdio.h>
#include<string.h>

struct Card
{
  char last[10];
  char first[10];
  char  phone_number[12];
};
typedef struct Card card;
#define array_size 100

void read_command(char* c);
void evaluate_command(char* c,card * newCard);
void insertCard(card * newCard);
void printCard(card *newCard);


int main ()
{

 char* c ;
 char command ;
 card newCard[array_size];
 read_command(c);
 evaluate_command( c, newCard);



return 0;
}
//===========================================================
void read_command(char* c)
{

   printf("myRolodex Command: ");
   scanf("%c" ,c);


}
//===========================================================
void evaluate_command(char* c,card *newCard)
{
  // card newCard[array_size];

  switch(*c)
  {
   case 'I' :
              insertCard(newCard);

   case 'P' :

               printCard(newCard);

   default :
             printf("Invalid command \n");

  }
//===============================================
   void insertCard(card *newCard)
{
    
  printf("Enter card: name phone \n ");
  scanf("%s ",&newCard->last[i]);
  scanf("%s ",&newCard->first[i]);
  scanf("%s", &newCard->phone_number[i]);
  
}

//==========================================================
void printCard(card *newCard)
{
    int i ;
    for(i = 0 ; i < array_size ;i++)
    {
    //   printf("Enter card: name phone \n ");
        printf("%s " , newCard->last[i]);
        printf("%s ", newCard->first[i]);
        printf("%s", newCard->phone_number[i]);
    }
}
closed account (SECMoG1T)
Hi the problem could be here
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 void insertCard(card *newCard) 
  { 
     printf("Enter card: name phone \n ");
     scanf("%s ",&newCard->last[i]);/// are you reading to the address of a pointer? 
     scanf("%s ",&newCard->first[i]);
     scanf("%s", &newCard->phone_number[i]); 
  } 

 void insertCard(card *newCard) 
  {
      printf("Enter card: name phone \n "); ///why not just use this
      scanf("%s ",newCard->last[i]); 
      scanf("%s ",newCard->first[i]); 
      scanf("%s", newCard->phone_number[i]);
   }

Good luck
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