Add show_histogram_text in all text

Histogram/text.cpp

@@ -10,7 +10,7 @@ void show_histogram_text(const std::vector<size_t>& bins) {
         if (bin > max_bin) {
             max_bin = bin;
         }
-    }
+
     for (size_t bin_value : bins) {
         if (bin_value < 100) std::cout << " ";
         if (bin_value < 10) std::cout << " ";

Histogram/text.h

@@ -1 +1,4 @@
+#pragma once
+#include <vector>
+void show_histogram_text(const std::vector<size_t>& bins);