Write a program to print a histogram of the frequencies of different characters in its input.
Draw the bars horizontally: a line for each character that appears, in order of character code, printed with printf("%3d |", c) followed by one * per occurrence. The input contains only ASCII characters (codes 0 to 127).
For the input abba followed by a newline:
10 |*
97 |**
98 |**
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