A library that contains functions used for working with strings.

int strlen(string str)

The function takes a string as an input, and return the length of the string excluding the NULL terminator.

int strcmp(string str1, string str2)

The function takes two strings as input and returns 1 if the strings are equal, and 0 otherwise.

int strcat(string str1, string str2)

The function takes two strings as input and returns a new string that is the result of the concatenation of the two. Note that the function will allocate heap memory and create the new string in it.

int strrvr(string str1, int in_place)

The function takes a string as an input and returns the reverse of it. The “in_place” parameter determines where the new result will be stored. A value of 1 reverses the string on the stack and modifies the original. A value of 0 will allocate space on the heap and create a new string there.