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C programming problem. Please read carefully and full answers, thanks.

Write a simple program that would take a string as input, and count the frequency of alphabet characters in that input string. output input(n) Hello World, Hello World d -> 2 times e -> 2 times h -> 2 times | -> 6 times O -> 4 times r -> 2 times W -> 2 times mississippi m -> 1 times i -> 4 times p-> 2 times -> 4 times