Frequency of a substring in a string

Given an input string and a substring. Find the frequency of occurrences of a substring in a given string.

Examples:

Input : man (pattern)
       dhimanman (string)
Output : 2

Input : nn (pattern)
       Banana (String)
Output : 0

Frequency of a substring in a string: https://www.geeksforgeeks.org/frequency-substring-string/