Problem when going back to main menu - C programming - c

Question

When this program is executed and case 1 is chosen, a submenu will be displayed. In this submenu there is an option to go back to the main menu, now this isn't displaying properly when chosen as it seems to be displaying the main menu twice as well as the default. This is the code:
#include <stdio.h>
#include "functions.h" //calls the functions.h file
int switch1();
int switch2();
int main() {
//Declaring variable
char command;
do {
do {
printf(SPLIT);
printf("\nEnter choice to operate one of the following functions.\n");
printf("1 - Operate using integer representation\n");
printf("2 - Operate using textual representation\n");
printf("0 - Quit\n");
printf("Choice:");
scanf("%c", &command);
switch (command) {
case '1':
switch1(); //Executes function switch1
break;
case '2':
switch2(); //Executes function switch2
break;
case '0':
printf(SPLIT);
printf("\nQuitting.");
printf(SPLIT);
return 0; //Program stops
default: //Switch statement reaches default if no other cases are reached
printf("\nIncorrect input, please re-try.\nEnter choice\n");
break;
}
} while(command != '0');
} while (command < '0' || command > '2');
return 0;
}
int switch1() {
//Declaring variables
char command;
int *array, *iZeroed = NULL;
printf(SPLIT);
printf("\nInteger representation will be used!\n");
array = generate(); //Executes function generate and sets the return to be array
do {
do {
printf("\nChoose an option:\n");
printf("1) Shuffle the array\n");
printf("2) Sort the array\n");
printf("3) Zero an element from the array\n");
printf("4) Display previous zeroed out element\n");
printf("0) Go back to main menu\n");
printf("Choice:");
scanf(" %c", &command);
switch (command) {
case '1':
array = shuffle(array); //Executes function shuffle and sets the return to be the new array
break;
case '2':
array = sort(array); //Executes function shuffle and sets the return to be the new array
break;
case '3':
iZeroed = shoot(array); //Executes function shoot and sets the return to be the element changed to 0
break;
case '4':
target(iZeroed); //Executes function target
break;
case '0':
return 0;
default: //Switch statement reaches default if no other cases are reached
printf(SPLIT);
printf("\nIncorrect input. Please re-enter an option\n");
break;
}
} while (command != '0');
} while (command < '0' || command > '1');
return 0;
}
This is the output I am getting when I choose to go back to main menu:
====================================================================
Choose an option:
1) Shuffle the array
2) Sort the array
3) Zero an element from the array
4) Display previous zeroed out element
0) Go back to main menu
Choice:0
====================================================================
Enter choice to operate one of the following functions.
1 - Operate using integer representation
2 - Operate using textual representation
0 - Quit
Choice:
Incorrect input, please re-try.
Enter choice
====================================================================
Enter choice to operate one of the following functions.
1 - Operate using integer representation
2 - Operate using textual representation
0 - Quit
Choice:

Answer 1

Place a space character int the format string for scanf() before the input specifier %c, and it means scanf() should drop whitespace characters there.
You are already doing so in your switch1() function, so you should also do so in your main() function.

Answer 2

printf("Choice:");
scanf("%c", &command);
Make it " %c"