Replace Character

Given an input string S and two characters c1 and c2, you need to replace every occurrence of character c1 with character c2 in the given string.

Input Format :

Line 1 : Input String S
Line 2 : Character c1 and c2 (separated by space)

Output Format :

Updated string

Constraints :

1 <= Length of String S <= 10^6

Sample Input :

abacd
a x

Sample Output :

xbxcd

 #include <iostream>

#include <cstring>

using namespace std;

#include "solution.h"

int lenght(char str[]){

    int count=0;

    for (int i=0;str[i]!='\0';i++){

        count++;

    }

    return count;

}

void replaceCharacter(char input[], char c1, char c2) {

    // Write your code here

    for(int i=0;i<lenght(input);i++){

        if(input[i]==c1){

            input[i]=c2;

        }

    }

}

int main() {

    char input[1000000];

    char c1, c2;

    cin >> input;

    cin >> c1 >> c2;

    replaceCharacter(input, c1, c2);

    cout << input << endl;

}