Ruby Simple Transformation String Method

def transform_string(string)
 transformed_string = string.dup
 char_positions = []

 ('A'..'Z').each do |char|
 break if char_positions.size >=2

 position = string.index(char)
 next if position.nil?

 char_positions << {char: char, position: position}
 end

 transformed_string[char_positions.first[:position]] = char_positions.last[:char]
 transformed_string[char_positions.last[:position]] = char_positions.first[:char]

 transformed_string
end

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