How to Compare Last n Characters of A String to Another String in C

Question

Imagine that I have two strings, one of them is a url like \"/sdcard/test.avi\" and the other one is\"/sdcard/test.mkv\". I want to write an if statement that looks whether

Answer 1

Just perform if ( strcmp(str1+strlen(str1)-4, str2+strlen(str2)-4) == 0 ) {}.

Make sure both strings are at least 4 characters long.