C inserting string into char pointer

C inserting string into char pointer

Hi all I trying to assign string into a char * pointer. Below is how I am
doing but I am getting this warning: assignment makes integer from pointer
without a cast.
What is the correct why to deal with strings in C ?
char* protoName = "";
if(h->extended_hdr.parsed_pkt.l3_proto==0)
*protoName = "HOPOPT";
else if(h->extended_hdr.parsed_pkt.l3_proto==1)
*protoName = "ICMP";
else if(h->extended_hdr.parsed_pkt.l3_proto==2)
*protoName = "IGMP";
else if(h->extended_hdr.parsed_pkt.l3_proto==3)
*protoName = "IGMP";
else if(h->extended_hdr.parsed_pkt.l3_proto==4)
*protoName = "IGMP";
char all[500];
sprintf(all,"IPv4','%s'",* protoName);