fix(db): add phone fixer

app/lib/phone_fixer.rb

@@ -0,0 +1,13 @@
+class PhoneFixer
+  def self.fix(phones_string)
+    phone_candidates = phones_string
+      .split(/-/)
+      .map { |phone_with_space| phone_with_space.gsub(/\s/, '') }
+
+    phone_candidates.find { |phone| phone.start_with?(/0(6|7)/) } || phone_candidates.first
+  end
+
+  def self.fixable?(phones_string)
+    /-/.match?(phones_string)
+  end
+end

spec/lib/phone_fixer_spec.rb

@@ -0,0 +1,49 @@
+describe PhoneFixer do
+  describe '#fix' do
+
+    subject { described_class.fix(phone_str) }
+
+    context 'when separated evenly with space between and after dash' do
+      let(:phone_str) { "0203040506 - 0607080900" }
+      it { is_expected.to eq('0607080900') }
+    end
+    context 'when separated oddly without space after dash' do
+      let(:phone_str) { "0203040506 -0607080900" }
+      it { is_expected.to eq('0607080900') }
+    end
+    context 'when separated oddly without space after dash' do
+      let(:phone_str) { "0203040506- 0607080900" }
+      it { is_expected.to eq('0607080900') }
+    end
+    context 'when having space inside number' do
+      let(:phone_str) { "020 3040 506 - 06070  8 09 00 " }
+      it { is_expected.to eq('0607080900') }
+    end
+  end
+
+  describe '#fixable' do
+
+    subject { described_class.fixable?(phone_str) }
+
+    context 'when separated evenly with space between and after dash' do
+      let(:phone_str) { "0203040506 - 0607080900" }
+      it { is_expected.to be_truthy }
+    end
+    context 'when separated oddly without space after dash' do
+      let(:phone_str) { "0203040506 -0607080900" }
+      it { is_expected.to be_truthy }
+    end
+    context 'when separated oddly without space after dash' do
+      let(:phone_str) { "0203040506- 0607080900" }
+      it { is_expected.to be_truthy }
+    end
+    context 'when having space inside number' do
+      let(:phone_str) { "020 3040 506 - 06070  8 09 00 " }
+      it { is_expected.to be_truthy }
+    end
+    context 'when separated by space' do
+      let(:phone_str) { "0203040506 0607080900" }
+      it { is_expected.to be_falsey }
+    end
+  end
+end