Tip 1 - Practice at Atleast 250 Questions
Tip 2 - Ex- Do at least 2 projects
Tip 1 : Have some projects on resume.
Tip 2 : Do not put false things on resume.


Given an input string S and two characters c1 and c2, you need to replace every occurrence of character c1 with character c2 in the given string.



1) A prime number is a number that has only two factors: 1 and the number itself.
2) 1 is not a prime number.
You are given a positive integer 'N'. Your task is to return all the prime numbers less than or equal to the 'N'.
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How do you remove whitespace from the start of a string?