char* getFileData(char* fileName) {
      if(!strcmp(fileName, "filea.csd"))
            return "this is the content of the file a";
      else if(!strcmp(fileName, "fileb.csd"))
            return "this is the content of the file b";
      else if(!strcmp(fileName, "filec.csd"))
            return "this is the content of the file c";
      else 
            return "";
} 

void main () {
      char* shader = strdup(getFileData("filea.csd"));
}