prepare the following functions, consistent with the prototypes shown:
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1) int strlen(char* s);
Given a string, return the number of characters in the string, NOT INCLUDING the null at the end.
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2) char* strcpy(char* s1, char* s2);
The function will copy the string s2 into the string s1. Note the function returns the address of the string.
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3) char* strcat(char* s1, char* s2);
The function concatenates the string s2 into the end of string s1. If s1 is "Hello " and s2 is "World" before, after calling strcat, s1 will be "Hello World"

Lab Assignment #8
LAB Assignment:
prepare main() functions to test and debug each function, using gets() and puts() for string input and output as follows:
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A) To demonstrate strlen(), input your first name using gets() and use printf to print the string followed by the number of characters in the string. An input of "Ken" would print 3. Show this with 3 string input exs.
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B) To demonstrate strcpy(), input your first name using gets(s1) and use strcpy() to copy it to a second string, s2 and print both strings with puts(). So an input of "Ken" would print: "string1 = Ken string2 = Ken".
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C) To demonstrate strcat(), use gets() to input your first name, last name, and Red ID as three separate strings, print them out, one per line, concatenate the three strings, and then use puts() to print out Hello followed by your name and Red ID. If the three input strings entered are "Ken" "Arnold" and "876543210", then it should print:
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Ken
Arnold
876543210
Hello Ken Arnold 87654321