Added simple implementation of hex/octal conversion

ch_03/exercise_03-05/compile.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+if [ ! -d "bin" ]; then
+    mkdir bin
+    echo "Created bin directory"
+fi
+
+current_dir=`pwd`
+hex_octal_conv_lib_root_dir="../../libraries/hex_octal_conv"
+hex_octal_conv_lib_include_dir="$hex_octal_conv_lib_root_dir/include"
+hex_octal_conv_lib_dir="$hex_octal_conv_lib_root_dir/bin/static"
+
+gcc -c main.c -I"$hex_octal_conv_lib_include_dir" -o bin/main.o -O3
+
+cd $hex_octal_conv_lib_root_dir
+./compile.sh "release"
+cd $current_dir
+
+gcc bin/main.o -L"$hex_octal_conv_lib_dir" -lhexoctalconv -o bin/a.out -O3