diff --git a/src/crab/gb/util.cr b/src/crab/gb/util.cr
deleted file mode 100644
index 3ba4428..0000000
--- a/src/crab/gb/util.cr
+++ /dev/null
@@ -1,43 +0,0 @@
-module GB
-  def hex_str(n : UInt8 | UInt16 | UInt32 | UInt64) : String
-    "0x#{n.to_s(16).rjust(sizeof(typeof(n)) * 2, '0').upcase}"
-  end
-
-  def array_to_uint8(array : Array(Bool | Int)) : UInt8
-    raise "Array needs to have a length of 8" if array.size != 8
-    value = 0_u8
-    array.each_with_index do |bit, index|
-      value |= (bit == false || bit == 0 ? 0 : 1) << (7 - index)
-    end
-    value
-  end
-
-  def array_to_uint16(array : Array(Bool | Int)) : UInt16
-    raise "Array needs to have a length of 16" if array.size != 16
-    value = 0_u16
-    array.each_with_index do |bit, index|
-      value |= (bit == false || bit == 0 ? 0 : 1) << (15 - index)
-    end
-    value
-  end
-
-  macro trace(value, newline = true)
-    {% if flag? :trace %}
-      {% if newline %}
-        puts {{value}}
-      {% else %}
-        print {{value}}
-      {% end %}
-    {% end %}
-  end
-
-  macro log(value, newline = true)
-    {% if flag? :log %}
-      {% if newline %}
-        puts {{value}}
-      {% else %}
-        print {{value}}
-      {% end %}
-    {% end %}
-  end
-end
diff --git a/src/crab/gba/util.cr b/src/crab/gba/util.cr
deleted file mode 100644
index 657cd07..0000000
--- a/src/crab/gba/util.cr
+++ /dev/null
@@ -1,63 +0,0 @@
-module GBA
-  def hex_str(n : UInt8 | UInt16 | UInt32 | UInt64, prefix = true) : String
-    (prefix ? "0x" : "") + "#{n.to_s(16).rjust(sizeof(typeof(n)) * 2, '0').upcase}"
-  end
-
-  macro bit?(value, bit)
-    ({{value}} & (1 << {{bit}}) > 0)
-  end
-
-  macro bits(value, range)
-    ({{value}} >> {{range.begin}} & (1 << {{range.to_a.size}}) - 1)
-  end
-
-  macro set_bit(value, bit)
-    ({{value}} | 1 << {{bit}})
-  end
-
-  macro clear_bit(value, bit)
-    ({{value}} & ~(1 << {{bit}}))
-  end
-
-  macro count_bits(value)
-    (8 * sizeof(typeof(n)))
-  end
-
-  def count_set_bits(n : Int) : Int
-    count = 0
-    count_bits(n).times { |idx| count += n >> idx & 1 }
-    count
-  end
-
-  def first_set_bit(n : Int) : Int
-    count = count_bits(n)
-    count.times { |idx| return idx if bit?(n, idx) }
-    count
-  end
-
-  def last_set_bit(n : Int) : Int
-    count = count_bits(n)
-    count.downto(0) { |idx| return idx if bit?(n, idx) }
-    count
-  end
-
-  macro trace(value, newline = true)
-    {% if flag? :trace %}
-      {% if newline %}
-        puts {{value}}
-      {% else %}
-        print {{value}}
-      {% end %}
-    {% end %}
-  end
-
-  macro log(value, newline = true)
-    {% if flag?(:log) %}
-      {% if newline %}
-        puts {{value}}
-      {% else %}
-        print {{value}}
-      {% end %}
-    {% end %}
-  end
-end