diff --git a/histogram.cpp b/histogram.cpp
index e43d6aa..7bcedcf 100644
--- a/histogram.cpp
+++ b/histogram.cpp
@@ -5,18 +5,29 @@
 #include "histogram.h"
 using namespace std;
 
-void
-find_minmax(vector<double> numbers, double &min, double &max)
+bool find_minmax(vector<double> numbers, double& min, double& max)
 {
-    min = numbers[0];
-    max = numbers[0];
-    for (size_t i = 1; i < numbers.size(); i++)
-        {
-        if (min > numbers[i])
-            min = numbers[i];
-        if (max < numbers[i])
-            max = numbers[i];
+    if (numbers.empty())
+    {
+        return true;
+    }
+    else
+    {
+        min = numbers[0];
+        for (auto i = 0; i < numbers.size(); i++) {
+            if (numbers[i] < min) {
+                min = numbers[i];
+            }
         }
+
+        max = numbers[0];
+        for (auto i = 0; i < numbers.size(); i++) {
+            if (numbers[i] > max) {
+                max = numbers[i];
+            }
+        }
+    }
+    return false;
 }
 
 vector <size_t> make_histogramm(vector<double>numbers, size_t bin_count)
diff --git a/main.cpp b/main.cpp
index eeb8002..38851b7 100644
--- a/main.cpp
+++ b/main.cpp
@@ -45,8 +45,8 @@ size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx)
 {
     size_t data_size = item_size * item_count;
     stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
-    buffer->write(static_cast<const char*>(items), data_size);
-    return 0;
+    buffer->write(reinterpret_cast<const char*>(items), data_size);
+    return data_size;
 }
 
 
@@ -59,18 +59,19 @@ download(const string& address)
     if(curl)
     {
         CURLcode res;
-        curl_easy_setopt(curl, CURLOPT_URL, address);
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
         res = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
         if (res != CURLE_OK)
 
             {
-            cout << curl_easy_strerror;
+            fprintf(stderr, "curl_easy_perform() failed: %s\n",curl_easy_strerror(res));
             exit(1);
             }
         }
-    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+    curl_easy_cleanup(curl);
 
     return input_data(buffer, false);
 }
diff --git a/unitest.cpp b/unitest.cpp
index b33aece..a569c4f 100644
--- a/unitest.cpp
+++ b/unitest.cpp
@@ -1,18 +1,56 @@
+
 #define DOCTEST_CONFIG_NO_MULTITHREADING
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 #include "doctest.h"
 #include "histogram_internal.h"
 #include <vector>
 #include <iostream>
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+
 TEST_CASE("distinct positive numbers")
 {
     double min = 0;
     double max = 0;
-    std::vector<double>v{1};
-    CHECK(v.size() != 0);
-    CHECK(v.size() != 1);
-    find_minmax(v, min, max);
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}
+
+TEST_CASE("vector with one element")
+{
+    double min = 0;
+    double max = 0;
+    find_minmax({1}, min, max);
     CHECK(min == 1);
+    CHECK(max == 1);
+}
+
+TEST_CASE("vector with same elements")
+{
+    double min = 0;
+    double max = 0;
+    find_minmax({2,2,2}, min, max);
+    CHECK(min == 2);
     CHECK(max == 2);
-    CHECK(min != max);
+}
+
+TEST_CASE("void vector")
+{
+    double min = 3;
+    double max = 2;
+    std::vector<double> numbers {};
+    bool check = find_minmax(numbers, min, max);
+    CHECK(check == true);
+}
+
+TEST_CASE ("distinct negative numbers")
+{
+    double min = 0;
+    double max = 0;
+    find_minmax({-1, -2}, min, max);
+    CHECK(min == -2);
+    CHECK(max == -1);
 }
diff --git a/unitest.depend b/unitest.depend
index 9543488..4075be4 100644
--- a/unitest.depend
+++ b/unitest.depend
@@ -1,9 +1,11 @@
 # depslib dependency file v1.0
-1682340687 source:c:\users\dell_latitude_e7440\desktop\lab34\unitest.cpp
+1685969210 source:c:\users\dell_latitude_e7440\desktop\lab34\unitest.cpp
 	"doctest.h"
 	"histogram_internal.h"
 	<vector>
 	<iostream>
+	"doctest.h"
+	"histogram_internal.h"
 
 1682337424 c:\users\dell_latitude_e7440\desktop\lab34\doctest.h
 	<signal.h>
@@ -50,10 +52,10 @@
 	<sys/time.h>
 	<unistd.h>
 
-1682340272 c:\users\dell_latitude_e7440\desktop\lab34\histogram_internal.h
+1685969301 c:\users\dell_latitude_e7440\desktop\lab34\histogram_internal.h
 	<vector>
 
-1682341053 source:c:\users\dell_latitude_e7440\desktop\lab34\histogram.cpp
+1685969551 source:c:\users\dell_latitude_e7440\desktop\lab34\histogram.cpp
 	<math.h>
 	<iostream>
 	<conio.h>