diff --git a/main.cpp b/main.cpp
index 5230b55..7eb0f81 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <vector>
+#include "histogram.h"
 
 using namespace std;
 const size_t SCREEN_WIDTH = 80;
@@ -33,40 +34,6 @@ Input input_data() {
     return in;
 }
 
-void find_minmax(const vector<double> &numbers, double &min, double &max){
-    min = numbers[0];
-    max = numbers[0];
-    for ( double x : numbers ){
-        if ( x < min ){
-            min = x;
-        } else if ( x > max ){
-            max = x;
-        }
-    }
-}
-
-vector<size_t> make_histogram(const vector<double> &numbers, size_t bin_count) {
-    double min = numbers[0];
-    double max = numbers[0];
-    find_minmax(numbers, min, max);
-    double bin_size = ( max - min ) / bin_count;
-    vector<size_t> bins ( bin_count );
-    for (size_t i=0; i <  numbers.size(); i++ ){
-        bool found = false;
-        for (size_t j = 0; ( j < bin_count - 1 ) && !found; j++ ){
-            auto lo = min + j * bin_size;
-            auto hi = min + ( j + 1 ) * bin_size;
-            if (lo <= numbers[i] && ( numbers[i] < hi )){
-                bins[j]++;
-                found = true;
-            }
-        }
-        if ( !found ){
-            bins[bin_count-1]++;
-        }
-    }
-    return bins;
-}
 
 void show_histogram_text(const vector<size_t> &bins){
     size_t maxbin = bins[0];