Shell interpreter in C

//Command interpreter

#include <stdio.h>

char prompt[2] = "\nSHELL>";
char* partOfString = "";
char* command = "";

char space = ' ';
char* echo = "echo";

void parseCommand()
{
    if(command[0] == '#') return; //this is a comment in the shell
    //use strcmp and fscanf for I/O
    //if (strcmp(command, "echo") printf("%s", partOfString);
}

void promptUser()
{
    while(command != "" || command != "exit")
    {
        printf("%s", prompt);
        scanf("%s", &command);
        parseCommand();
        if (command == "exit") break;
    }
}

int main()
{
    promptUser();
    getchar();
    return 0;
}