String.h
String Manipulations In C Programming Using Library Functions
Strings are often needed to be manipulated by programmer according to the need of a problem. All string manipulation can be done manually by the programmer but, this makes programming complex and large. To solve this, the C supports a large number of string handling functions.
Strings handling functions are defined under "string.h" header file, i.e, you have to include the code below to run string handling functions.
#include <lstring.h>