Function to search a text document for a word in C

I wrote this function to search a text file (which currently just says "cube") for one of the words and then call the corresponding function. However, I am getting the 'Error: No Function Found.' message.

Could anyone help me in identifying my problem?

void read(){
    const char cube[4] = "cube";
    const char cone[4] = "cone";
    const char sphere[6] = "sphere";
    const char cylinder[8] = "cylinder";

    char line[1024] ;
    FILE* fp = fopen("instructions.txt", "r") ;
    while (fgets(line , sizeof(line) , fp )!= NULL)
    {
        if (strstr(line , cube)!= NULL){
            void cube();
        }
        else if (strstr(line , cone)!= NULL){
            void cone();
        }
        else if (strstr(line , sphere)!= NULL){
            void sphere();
        }
        else if (strstr(line , cylinder)!= NULL){
            void cylinder();
        }
        else {
            printf("Error: No Function Found./n");
        }
    }
    fclose(fp);
    free(line);
    return;
}