insertion and deletion in arrays

#include <stdio.h>

void display(int arr[], int n){
    for (int i=0 ;  i< n; i++)
    {
        printf("%d ", arr[i]);
    }
    printf("\n");
}

int indInsertion(int arr[], int size, int element , int capacity, int index){
    
    if(size>=capacity){
        return -1;
    }
    for (int i=size -1; i>=index; i--)
    {
        arr[i+1]=arr[i];
    }
    arr[index]= element;
    return 1;
}

void indDeletion(int arr[], int size, int index)
{
    for (int i= index; i< size-1; i++)
    {
        arr[i] = arr[i+1];
    }
}
int main() {
    int arr[100] = {7, 8, 12, 27, 88};
    int size = 5, element =45, index=1;
    display(arr, size);
    indInsertion(arr, size, element, 100, index);
    size +=1;
    display(arr, size);
    indDeletion(arr, size, index);
    size -=1;
    display(arr, size);

    return 0;
}