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Simple C programming problem. read carefully and full answers please. thanks.

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