добавил вывод текста

main.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 #include <vector>
 #include "histogram.h"
+#include "text.h"
 
 using namespace std;
 
@@ -27,22 +28,6 @@ Input input_data()
     return in;
 }
 
-void show_histogram_text(const vector<size_t>& bins) {
-    const size_t SCREEN_WIDTH = 80;
-    size_t max_count = 0;
-    for (size_t count : bins) {
-        if (count > max_count) max_count = count;
-    }
-
-    for (size_t bin : bins) {
-        size_t height = bin * SCREEN_WIDTH / max_count;
-        for (size_t i = 0; i < height; i++) {
-            cout << '*';
-        }
-        cout << endl;
-    }
-}
-
 int main() {
     auto in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);

text.cpp

@@ -0,0 +1,22 @@
+#include "text.h"
+#include <iostream>
+#include <vector>
+#include <cstddef>
+
+using namespace std;
+
+void show_histogram_text(const vector<size_t>& bins) {
+    const size_t SCREEN_WIDTH = 80;
+    size_t max_count = 0;
+    for (size_t count : bins) {
+        if (count > max_count) max_count = count;
+    }
+
+    for (size_t bin : bins) {
+        size_t height = bin * SCREEN_WIDTH / max_count;
+        for (size_t i = 0; i < height; i++) {
+            cout << '*';
+        }
+        cout << endl;
+    }
+}

text.h

@@ -0,0 +1,9 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+#include <vector>
+#include <cstddef>
+
+void show_histogram_text(const std::vector<size_t>& bins);
+
+#endif // TEXT_H_INCLUDED