Please write me the code!!!!!!!!
Q. Write a function that will scan a string for theoccurence of given substring. The prototype of the function would be:
char *substr(char *string1, char *string2);
The function must return a pointer to element in string1 where string2 begins. If string2 doesn't occur in string1 then substr() should return NULL.
For example, if String1 is "This is a car" ans string 2 is "is" then substr() must return address of 'is' in string 1.