non_repeated_char.rb

# Define a method that takes a string 
def first_nonrepeated_char( string )
  
  # Convert that string in to an Array of characters
  chars = string.gsub(" ", "").chars
  
  # Loop over the character Array, and compare
  # each element to every other element
  chars.each_with_index do |ch, index|
    match = false
    chars.each_with_index do |ch2, index2|
      match = true if ch == ch2 && index != index2
    end
    
    # Return the first character without a match
    return ch unless match
  end
  
  # Return nil if you did not find a non-repeated character
  return nil
end