write the function that prints the `frequency` of the each letters in the string taken as a parameter in matlab

main.m
function freq = letterFrequency(inputString)
% Convert input string to lowercase and remove non-letter characters
cleanString = regexprep(lower(inputString), '[^a-z]', '');

% Initialize struct to hold frequency counts
freq = struct();

% Iterate through each letter in the clean string and update frequency counts
for i = 1:length(cleanString)
    letter = cleanString(i);
    if isfield(freq, letter)
        freq.(letter) = freq.(letter) + 1;
    else
        freq.(letter) = 1;
    end
end
end
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