some solutions for projects on odin project

substrings.rb

@@ -0,0 +1,24 @@
+def substrings(str_input, dictionary)
+  unless str_input.is_a?(String) and dictionary.is_a?(Array)
+    raise TypeError("Invalid type provided")
+  end
+
+  result = {}
+
+  all_words = str_input.downcase.gsub(/[^0-9a-z ]/i, '').split(" ")
+
+  dictionary.each do |key|
+    all_words.each do |word|
+      if word.include?(key.downcase)
+        result[key] = result.has_key?(key) ? result[key] + 1 : 1
+      end
+    end
+  end
+
+  result
+end
+
+
+dictionary = ["below","down","go","going","horn","how","howdy","it","i","low","own","part","partner","sit"]
+
+print substrings("Howdy partner, sit down! How's it going?", dictionary)