From 4e073f5b9fe0cb686e7d4e90a5368540a9ac7ce9 Mon Sep 17 00:00:00 2001
From: Swastika Gupta <64654203+Swastyy@users.noreply.github.com>
Date: Sat, 31 Jul 2021 16:17:38 +0530
Subject: [PATCH] Update karatsuba_algorithm_for_fast_multiplication.cpp

---
 .../karatsuba_algorithm_for_fast_multiplication.cpp        | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/divide_and_conquer/karatsuba_algorithm_for_fast_multiplication.cpp b/divide_and_conquer/karatsuba_algorithm_for_fast_multiplication.cpp
index 31ac8d84c..f80d00272 100644
--- a/divide_and_conquer/karatsuba_algorithm_for_fast_multiplication.cpp
+++ b/divide_and_conquer/karatsuba_algorithm_for_fast_multiplication.cpp
@@ -59,9 +59,10 @@ std::string addStrings( std::string first, std::string second )
         int64_t secondBit = second.at(i) - '0';
  
         int64_t sum = (firstBit ^ secondBit ^ carry)+'0'; // sum of 3 bits
-        sum = std::to_string(sum);
-        sum += result;
-        result = sum;
+        std::string temp;
+        temp = std::to_string(sum);
+        temp += result;
+        result = temp;
  
         carry = (firstBit&secondBit) | (secondBit&carry) | (firstBit&carry); // sum of 3 bits
     }