Fix some rubocop warnings

problems/1108-defanging-an-ip-address/main.rb

@@ -1,6 +1,5 @@
 # @param {String} address
 # @return {String}
 def defang_i_paddr(address)
-    new_addr = address.gsub(".", "[.]")
-    return new_addr
+  address.gsub('.', '[.]')
 end

problems/1108-defanging-an-ip-address/test.rb

@@ -1,11 +1,9 @@
-require_relative "main"
-require "test/unit"
+require_relative 'main'
+require 'test/unit'
 
 class TestDefangIpAddr < Test::Unit::TestCase
- 
   def test_simple
-    assert_equal("1[.]1[.]1[.]1", defang_i_paddr("1.1.1.1") )
-    assert_equal("255[.]100[.]50[.]0", defang_i_paddr("255.100.50.0") )
+    assert_equal('1[.]1[.]1[.]1', defang_i_paddr('1.1.1.1'))
+    assert_equal('255[.]100[.]50[.]0', defang_i_paddr('255.100.50.0'))
   end
- 
 end

problems/14-longest-common-prefix/main.rb

@@ -1,21 +1,18 @@
 # @param {String[]} strs
 # @return {String}
 def longest_common_prefix(strs)
-  # Find min length
-  min_length = strs.map{|s| s.length}.min()
+  min_length = strs.map(&:length).min
 
-  res = ""
-  for i in 0..min_length - 1 do
+  res = ''
+  (0...min_length).each do |i|
+    # Compare characters
     strs.each do |st|
-      # If characters doesn't match
-      if st[i] != strs[0][i]
-        return res
-      end
+      return res if st[i] != strs[0][i]
     end
 
     # All characters match
     res += strs[0][i]
   end
 
-  return res
+  res
 end

problems/14-longest-common-prefix/test.rb

@@ -1,18 +1,16 @@
-require_relative "main"
-require "test/unit"
+require_relative 'main'
+require 'test/unit'
 
 class TestLCP < Test::Unit::TestCase
- 
   def test_simple
-    assert_equal("fl", longest_common_prefix(["flower","flow","flight"]) )
+    assert_equal('fl', longest_common_prefix(%w[flower flow flight]))
   end
 
   def test_empty_prefix
-    assert_equal("", longest_common_prefix(["dog","racecar","car"]) )
+    assert_equal('', longest_common_prefix(%w[dog racecar car]))
   end
 
   def test_empty_string
-    assert_equal("", longest_common_prefix([""]) )
+    assert_equal('', longest_common_prefix(['']))
   end
-
 end