bob exercise, all tests are passed

cpp/bob/bob.cpp

@@ -0,0 +1,57 @@
+#include "bob.h"
+
+#include <algorithm>
+#include <locale>
+#include <string>
+
+namespace bob {
+
+
+using namespace std;
+
+namespace {
+
+void trim_spaces(string &str)
+{
+    str.erase(remove_if(str.begin(), str.end(),
+                        [](char c){return isspace(static_cast<unsigned char>(c));}),
+              str.end());
+}
+
+string to_uppercase(const string &str)
+{
+    string result = str;
+    for (auto & c: result)
+        c = toupper(c);
+
+    return result;
+}
+
+bool has_alpha(const string &str)
+{
+    return find_if(str.begin(), str.end(),
+            [](char c){return isalpha(static_cast<unsigned char>(c));}) != str.end();
+}
+
+}
+
+const char * hey(const char input[])
+{
+
+    string str(input);
+    trim_spaces(str);
+
+    if (str.empty())
+        return "Fine. Be that way!";
+
+    if (has_alpha(str) && str == to_uppercase(str))
+        return "Whoa, chill out!";
+
+    if ('?' == str.back())
+        return "Sure.";
+
+    return "Whatever.";
+}
+
+}
+