diff --git a/homework_01/task_01/src/utils.cpp b/homework_01/task_01/src/utils.cpp
index a6989bd..3d7b287 100644
--- a/homework_01/task_01/src/utils.cpp
+++ b/homework_01/task_01/src/utils.cpp
@@ -1,7 +1,37 @@
 #include "utils.hpp"
 
 #include <stack>
+#include <iostream>
+#include <vector>
 
-std::vector<std::string> SplitString(const std::string& data) {
-  return {};
-}
+using namespace std;
+
+vector <string> SplitString(const string& s){
+    
+    string Current_String = "";
+    const char* ptr = &(s[0]);
+    vector <string> result;
+
+    while(*ptr != '\0'){
+        if (*ptr == '(') {
+            while((*ptr != ')') && (*ptr != '\0')){
+                Current_String += *ptr;
+                ++ptr;
+            }
+            Current_String += *ptr;
+            ++ptr;
+            result.push_back(Current_String);
+            Current_String = "";
+        }
+        if ((*ptr == ' ') || (*ptr == '\t')) {
+            if (Current_String != "") result.push_back(Current_String);
+            Current_String = "";
+        }
+        else {
+            Current_String += *ptr;
+        }
+        ++ptr;
+    }    
+
+    return result;
+}
\ No newline at end of file
diff --git a/homework_01/task_01/src/utils.hpp b/homework_01/task_01/src/utils.hpp
index 539ba98..aa40918 100644
--- a/homework_01/task_01/src/utils.hpp
+++ b/homework_01/task_01/src/utils.hpp
@@ -4,4 +4,4 @@
 #include <string_view>
 #include <vector>
 
-std::vector<std::string> SplitString(const std::string& data);
+std::vector<std::string> SplitString(std::string& s);
diff --git a/homework_01/task_02/src/utils.cpp b/homework_01/task_02/src/utils.cpp
index ebc7ffc..cc1e6d6 100644
--- a/homework_01/task_02/src/utils.cpp
+++ b/homework_01/task_02/src/utils.cpp
@@ -1,7 +1,40 @@
 #include "utils.hpp"
 
 #include <stack>
+#include <iostream>
+#include <vector>
 
-int Calculate(const std::string& data) {
-  return 0;
+using namespace std;
+
+int Calculate(const string& str) {
+
+    string CurrentString = "";
+    const char* ptr = &(str[0]);
+    vector <string> data;
+
+    while(*ptr != '\0'){
+        if ((*ptr == '+') ||(*ptr == '-')||(*ptr == '*')||(*ptr == '/')) {
+            if (CurrentString != ""){ 
+            data.push_back(CurrentString);
+            CurrentString = "";
+            }
+            CurrentString += *ptr;
+            data.push_back(CurrentString);
+            CurrentString = "";
+            ++ptr;
+        }
+
+        CurrentString += *ptr;
+        ++ptr;
+    }
+    data.push_back(CurrentString);
+    
+    int a = stoi(data[0]);
+    int b = stoi(data[2]);
+
+    if (data[1] == "+") {return a + b;}
+    else if (data[1] == "-") {return a - b;}
+    else if (data[1] == "*") {return a * b;}
+    else if (data[1] == "/") {return a / b;}
+    else return 0;
 }
diff --git a/homework_01/task_02/src/utils.hpp b/homework_01/task_02/src/utils.hpp
index f1bceeb..c3f25af 100644
--- a/homework_01/task_02/src/utils.hpp
+++ b/homework_01/task_02/src/utils.hpp
@@ -4,4 +4,4 @@
 #include <string_view>
 #include <vector>
 
-int Calculate(const std::string& data);
+int Calculate(std::string& data);