Significance of line

#1

#include
#include
using namespace std;

void removenakli(char a[]){

int len = strlen(a);

int i = 0,j=1;
while (j<len){
    if(a[i]!=a[j]){
        i++;
        a[i]=a[j];
    }
    j++;
}
   a[i + 1] = '\0';

return;

}
int main() {
char a[1000];

cin.getline(a,1000);

cout<<a<<endl;

 removenakli(a);
 
cout<<a<<endl;  
  
  
return 0;

}

in this code what is the significance of this line ;-

a[i + 1] = ‘\0’;

#2

The line a[i + 1] = '\0'; terminates the string by adding a null character at the end.

#3

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