C fifo linked list char push -

i'm trying understand fifo linked list , found example here example , , i'm trying input char instead of int

 #include <stdio.h>  #include <conio.h>  #include <stdlib.h>   struct node  {         char data;         struct node* next;  }*rear, *front;  void delqueue() {        struct node *temp, *var=rear;       if(var==rear)       {              rear = rear->next;              free(var);       }       else       printf("\nqueue empty"); }  void push(char *value) {      struct node *temp;      temp=(struct node *)malloc(sizeof(struct node));      temp->data=value;      if (front == null)      {            front=temp;            front->next=null;            rear=front;      }      else      {            front->next=temp;            front=temp;            front->next=null;      } }  void display() {      struct node *var=rear;      if(var!=null)      {            printf("\nelements as:  ");            while(var!=null)            {                 printf("\t%d",var->data);                 var=var->next;            }      printf("\n");      }      else      printf("\nqueue empty"); }  int main() {      int i=0;      char ch;      front=null;      printf(" \n1. push queue");      printf(" \n2. pop queue");      printf(" \n3. display data of queue");      printf(" \n4. exit\n");      while(1)      {           printf(" \nchoose option: ");           //scanf("%d",&i);           ch = getchar();           switch(ch)           {                 case '+':                 {                      char value[20];                      printf("\nenter valueber push queue : ");                      scanf("%s", value);                      push(value);                      printf("%s",value);                      display();                      break;                 }                 case '-':                 {                      delqueue();                      display();                      break;                 }                 case '*':                 {                      display();                      break;                 }                 case '$':                 {                      exit(0);                 }                 default:                 {                      printf("\nwrong choice operation");                 }           }      } } 

i can't understand warning on line 26: warning: assignment makes integer pointer without cast

i can input text, example: "hello world", when want display it, showed "-9". confused.

data defined char, assigning char * (char pointer) it. creates warning, , surely won't work expect.