Parse Command

char** parse_command(char input[]){
    static char* strings[100];
    int x = 0;
    while(strings[x] != NULL){
        strings[x] = NULL;
        x++;
    }
    static char* quotations[3];
    x=0;
    while(quotations[x] != NULL){
        quotations[x] = NULL;
        x++;
    }
    int index = 0;
    int iQuotation = 0;
    char* tknQuotation = strtok(input, "\"");
    while(tknQuotation != NULL){
        quotations[iQuotation++] = tknQuotation;
        tknQuotation = strtok(NULL, "\"");
    }
    if(quotations[1] == NULL){
        char* token = strtok(input, " \n"); // split string by space and newline
        while (token != NULL){
            if (token[0] == '$'){
                char* varName = token + 1;
                for(int i = 0; i < varIndex; i++){
                    if(!strcmp(varName, varNames[i])){
                        strings[index++] = varValues[i];
                    }
                }
            }
            else{
                strings[index++] = token ;
            }
            token = strtok(NULL, " \n");
        }
        strings[index] = NULL;
    }
    else{
        for(int i = 0; i < 3; i++) {
            if(i!=1){
                char* token = strtok(quotations[i], " \n");
                while (token != NULL){
                    strings[index++] = token;
                    token = strtok(NULL, " \n");
                }
            }
            else{
                char* q[100];
                int j = 0;
                char* tkn = strtok(quotations[i], " \n");
                while(tkn != NULL){
                    if(tkn[0] == '$'){
                        char* varName = tkn + 1;
                        for(int k = 0; k < varIndex; k++){
                            if(!strcmp(varName, varNames[k])){
                                char* token = strtok(varValues[k], "\"");
                                q[j++] = token;
                            }
                        }
                    }
                    else {
                        q[j++] = tkn;
                    }
                    tkn = strtok(NULL, " \n");
                }
                strings[index++] = q;
            }
        }
    }
    return strings;
}