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(1) Complete C program that asks the user to enter a string, then 
    prints the number of characters in the string, and the number
    of upper-case letters.


















(2) main function for a C program that takes its first command-line
    argument as the name of a file, open the file, read the contents of the file 
    and test whether the character 'a' is in the file.  print either 
    "File contains a" or "File does not contain a".