Answer:
see explaination 
Explanation:
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
//Define the function to count a
// specific character in a line.
int countChar(string line, char c)
{
 //Define the variable.
 int tc = 0;
 //Iterate through the string.
 for (int i = 0; i < line.length(); i++)
 {
 //Find the matching character.
 if (line[i] == c)
 tc++;
 }
 //Return the character counts.
 return tc;
}
//Define the function to remove the spaces.
string removeSpace(string input)
{
 //Find the string length.
 int strlength = input.length();
 //Itearte through the string.
 for (int i = 0; i < strlength; i++) {
 //set the value.
 i = 0;
 //Check for the spaces.
 if (input[i] == ' ') {
 //Remove the extra space.
 for (int j = 0; j < strlength; j++) {
 input[j] = input[j + 1];
 }
 //Update the string length.
 strlength--;
 }
 //if there is no extra space left.
 else
 break;
 }
 //Return the input string
 return input;
}
//Define the main function.
int main() { 
 //Define the variables.
 int n, ind = 0, ob = 0;
 string lines[100], input;
 int max = 0;
 //Prompt the user for input.
 cout << "Enter lines one by one: " << endl;
 //Get the user input and exit when
 // user enters twice after the input.
 do
 {
 getline(cin, input);
 //Remove the extra space.
 input = removeSpace(input);
 //Store the line by line input in the
 //String array.
 if (input.length() > max)
 max = input.length();
 lines[ind++].append(input);
 } while (!input.empty() != 0);
 //Set the value for number of lines.
 n = ind;
 cout << endl;
 //Dsipaly the message
 cout << endl << "Indented code is:" << endl << endl;
 //Iterate through the string array. 
 for (int i = 0; i <= n; i++)
 {
 string tab = "";
 //Check for the closing braces.
 int close = countChar(lines[i], '}');
 //Set the value for braces.
 ob -= close; 
  
 //Indent the code.
 for (int j = 0; j < ob; j++)
 {
 tab += " ";//it takes 4 whitespace
 //tab+= "\t";//it takes 8 whitespace
 }
 
 //Print the line.
 cout << tab << lines[i]<< endl;
 //Check for the opening braces.
 int op = countChar(lines[i], '{');
 //Update the opening brace count.
 ob = ob + op;
 }
 //system("pause");
 //Return the value 0.
 return 0;
}