For this question, you need to provide a function definition and a simple testing code. -- Define a function that takes a C-string str as its argument and returns a new C-string that contains all the characters in str except the lower case letters. The characters in the returned C-string are in the same order as in the argument C-string str. For example, if str is "aBCd!!", the function should return C-string "BC!!". Another example, if stris "How are u?", the function should return "H ?" Note: